What is Facebook? Understanding the World’s Leading Social Network

Facebook is a social networking platform where people create profiles, connect with friends and family, share photos and videos, join groups, and organise events. Launched in 2004, it is the most widely used social network in the world and in 2026 it works as an AI-driven discovery and answer engine as much as a friends-and-family feed.

The user figure most often quoted for Facebook is out of date. Meta stopped publishing Facebook-only user counts after 31 December 2023, when it last reported 3.07 billion monthly active users and 2.11 billion daily active users. Its only recurring audience figure now is Family daily active people, which combines Facebook, Instagram, Messenger and WhatsApp: 3.60 billion, averaged across June 2026, up 3% year on year (Meta Q2 2026 results, 29 July 2026). Any article quoting “3 billion Facebook users” without attaching a date is citing the 2023 disclosure.

For UK businesses, the relevant numbers are local ones. Meta’s own advertising resources indicated 38.8 million Facebook users in the UK in late 2025, according to DataReportal’s Digital 2026 report though that figure measures potential advertising reach rather than logged-in accounts. Ofcom’s Online Nation 2025, published in December 2025, put Facebook’s daily reach among UK online adults at 63%, second only to WhatsApp, with the Facebook and Messenger combination reaching 93% of online adults over a month.

But what is Facebook beyond a place to share holiday photos and birthday messages? For UK businesses, it remains the widest-reaching single social platform in the country, offering public Pages, detailed advertising tools, community Groups and direct customer messaging. What has changed and changed fast is how content gets distributed and how much of the audience a business can expect to reach without paying.

What Facebook is in 2026

Facebook in 2026 works differently from the platform most explainers describe. Four changes matter, and all of them landed within the last eighteen months.

Search now answers questions directly

On 15 June 2026, Meta launched AI Mode, a search tab that uses Meta AI to answer plain-language questions drawn from public posts, Groups and Reels rather than returning a ranked list of links. It runs on Muse Spark, the first model from Meta Superintelligence Labs.

For businesses, the implication is straightforward: public Facebook content is now retrieval material for an answer engine. Group discussions, public posts and Reels can be summarised into an answer a customer reads without ever clicking through. Teams that spent the last two years optimising for Google’s AI answers have built nothing for this surface.

Half the feed comes from accounts you don’t follow

Meta’s own Widely Viewed Content Report shows that in Q2 2026, 49.6% of US Feed views came from posts shared by friends, from Groups people had joined, or from public followers. Of the remaining 50.4%, 36.6% came from in-feed recommendations content from sources the viewer is not connected to at all.

Reach on Facebook is now earned by topical relevance to a recommendation system, not accumulated through follower count. A Page with 10,000 followers has no guarantee of reaching them, and a Page with 200 followers can reach far beyond them if the content matches what the algorithm believes people want.

Meta has partly reversed course on that

In early 2026, Mark Zuckerberg introduced a Friends tab showing only posts from connections, with no recommended content, describing it as the first phase of bringing back the original Facebook experience. Facebook now effectively runs two feeds in parallel: an interest-based discovery feed and a connections-only one. Which your customers use affects what it takes to reach them.

Meta’s centre of gravity moved from the metaverse to AI

The metaverse ambitions behind the 2021 rebrand have been wound down rather than paused. Meta cut around 10% of Reality Labs staff in January 2026, removed Horizon Worlds from the Quest store at the end of March, and took it out of VR entirely on 15 June 2026. It survives as a mobile-only app. Reality Labs has absorbed more than $70 billion in losses since 2021.

Artificial intelligence is the company’s focus instead, through Meta Superintelligence Labs and sharply increased capital spending on AI infrastructure. For anyone marketing on Facebook, the practical effect is that AI now shapes what appears in feeds, how advertising is targeted and, since June 2026, how Facebook’s own search answers questions.

Where Facebook came from

The story of how Facebook was built gives useful context for its current features and business applications. What began as a university networking tool became one of the world’s most influential digital platforms, and that history explains a good deal about how the platform still works.

How Facebook was created

Mark Zuckerberg first built a site called Facemash, which matched Harvard students on appearance. That early project showed the potential for a digital platform to drive social connection. Building on the idea, Zuckerberg set out to replace the paper “face book” directories that Harvard colleges gave students with a dynamic digital version where people could share thoughts, feelings and life experiences directly.

The name references those physical directories. By digitising the concept, Zuckerberg created something that could scale globally while still feeling personal.

From its Harvard-only start in 2004, Facebook opened to other universities, then to the general public in 2006. Its growth reflected how well it met a basic human need: the desire to connect and share. That original purpose still sits underneath everything the platform has become, even as the feed has shifted towards algorithmic discovery.

Facebook’s parent company, Meta

In October 2021, Facebook’s parent company rebranded as Meta, signalling a shift towards connected virtual spaces alongside its existing apps. The rebrand did not change the Facebook platform, which still operates under its familiar name, but it did mark the company’s wider direction and its investment in Instagram, WhatsApp, Messenger and newer products such as Threads.

That direction has since changed again. As covered above, Meta has pulled back sharply from virtual reality and redirected its spending towards AI. For a business planning Facebook activity, the relevant takeaway is that the platform’s roadmap now runs through AI features in search, in ad targeting, in creative tools and in business messaging rather than through immersive virtual environments.

Core Facebook features and functionality

Understanding Facebook’s key features helps businesses and individuals get more from the platform, from basic profile creation through to the marketing tools that matter most for SMEs.

Creating your Facebook timeline

When you join Facebook, you create a timeline: your digital space for sharing life events, memories and experiences. Facebook calls it a timeline rather than a profile because it presents content chronologically, building an ongoing record of personal or business activity.

For businesses, the equivalent is a Facebook Page a public profile customers can follow to receive updates, engage with content and learn about what you offer. Pages carry the advertising tools, analytics and messaging features that personal profiles do not.

Connecting with your network

Facebook’s value comes from network effects. Individuals connect by sending friend requests, which can be accepted or declined. For businesses, this translates into Page followers and customer engagement people choose to follow a brand because they find value in its content.

The platform offers several routes to connection. Search finds specific people or businesses by name. “People you may know” suggestions recommend connections based on mutual friends, shared workplaces, education or contact information. Friend-finding tools can scan email contacts to identify which of them use Facebook.

One important caveat for 2026: follower growth no longer guarantees reach. With more than a third of feed views coming from recommendations rather than connections, the follower count is a weaker predictor of distribution than it was even two years ago.

Privacy and control settings

Facebook gives users detailed controls over who sees what on their timeline. Given the platform’s reach and UK GDPR obligations, these controls matter for personal users and businesses alike.

You can customise visibility for individual posts, photo albums and personal information. For UK businesses, understanding these settings is essential both for managing your own Page and for handling customer data properly when running advertising campaigns.

Facebook Messenger and communication tools

Facebook’s messaging features go well beyond public posts and comments. Messenger, launched in 2008 as a standalone app, remains useful for customer communication though its UK reach has slipped. Ofcom’s Online Nation 2025 recorded Messenger’s daily reach among UK online adults at 22%, down from the previous year and enough to drop it out of the top five UK apps, with YouTube taking its place.

Messenger provides instant messaging without requiring users to open the main feed. Beyond text, it offers voice and video calls, file and document sharing, location sharing, GIFs and stickers, voice messages, payments and group chats. File sharing now supports documents up to 100MB, including Word, Excel and PDF formats.

Meta has also been expanding AI in business messaging, with agents that can answer customer questions, qualify leads and book appointments across its messaging platforms.

For businesses looking to improve customer service, ProfileTree builds messaging strategies that integrate Messenger with website chat, email marketing and other customer touchpoints, so conversations that start on Facebook don’t get lost between channels.

Using visual content on Facebook

Visual content drives most of the engagement on Facebook. Photos, videos and GIFs, used well, strengthen both personal sharing and business marketing and with recommendations now driving a large share of distribution, the quality of the creative matters more than the size of the audience it starts with.

Sharing photos on Facebook

Facebook allows unlimited photo uploads to your timeline, with visibility controlled through privacy settings. You can share individual photos or build albums for weddings, corporate events, product launches and other occasions.

For businesses, photo sharing serves several purposes: product photography displays your offering at its best, behind-the-scenes content humanises the brand, event coverage documents milestones, and user-generated content provides authentic social proof.

Video content strategy

Video regularly achieves higher engagement than static images. Autoplay on mobile captures attention immediately, so the first few seconds carry disproportionate weight, whether the post is personal or commercial.

Facebook offers several video formats UK businesses should know: Facebook Live for real-time interaction, Reels for short-form video, Watch for organising content from Pages you follow, and native sharing that lets users pass content across their own networks. Reels in particular is where unconnected discovery happens the format largely ignores who follows you and ranks on retention and interest signals instead.

ProfileTree’s video production services help UK businesses create professional, engaging Facebook videos from concept through editing and distribution, so the content fits the wider marketing plan rather than sitting on its own.

Business applications of Facebook video

Facebook video remains one of the more effective marketing tools available to businesses. Detailed targeting combined with an engaging format creates real opportunities to reach your ideal customers.

Brand awareness campaigns introduce your business to new audiences through storytelling. Tutorial and how-to content builds trust while demonstrating expertise. Targeted advertising uses Facebook’s data to show videos to users most likely to convert. Live sessions host real-time conversations. Customer success stories give prospective customers proof they can relate to.

Using GIFs on Facebook

GIFs short looping animations without sound remain a common part of Facebook communication. They work in posts, comments and messages, adding personality without much production effort.

For businesses, GIFs help adverts stand out in a busy feed through motion, make comment replies more memorable, demonstrate product features in a few seconds, and make Messenger conversations feel more human.

Facebook for UK business marketing

Facebook has evolved from a personal networking tool into one of the most sophisticated business marketing platforms available. Alongside the other channels covered in ProfileTree’s rundown of the main social media sites, it still holds the widest reach of any single platform in the UK.

Why Facebook marketing matters for UK businesses

Facebook’s UK reach is substantial and skews older. Ofcom’s Online Nation 2025 placed Facebook second only to WhatsApp for daily reach among UK online adults at 63%. Ofcom’s Adults’ Media Use and Attitudes report, published 2 April 2026, found Facebook remains the most popular platform among the oldest age group used by 81% of online adults aged 75 and over, against 3% for Snapchat and 7% for TikTok in the same group. That older, often financially established audience is one newer platforms simply do not reach in the same way.

Two further figures should shape the budget conversation.

First, organic reach is no longer a function of your follower count. Meta’s Widely Viewed Content Report shows 36.6% of US Feed views in Q2 2026 came from in-feed recommendations from unconnected accounts, with 49.6% coming from friends, Groups and followers.

Second, audiences are becoming less active. Ofcom found that around half of adult social media users (49%) now actively post, share or comment, down from 61% in 2024. Exploration of new websites has fallen too.

Taken together, a Facebook presence built entirely on unpaid posting reaches a shrinking share of an audience that is itself engaging less. Closing that gap takes paid distribution, content strong enough to be recommended to strangers, or both. Working out which of those a business can realistically sustain is a more useful first question than how often to post.

For UK businesses, the platform still opens several routes: precise audience targeting by demographics, interests and behaviours; local promotion through geo-targeting to specific postcodes; B2B lead generation aimed at decision-makers; e-commerce through Facebook Shops; and direct customer service through Messenger and comments.

“Facebook marketing isn’t about vanity metrics anymore,” notes Ciaran Connolly, founder of ProfileTree. “UK businesses that succeed on the platform focus on genuine customer connection and measurable business outcomes. When integrated properly with web design, SEO, and content strategy, Facebook becomes a powerful engine for sustainable growth.”

Facebook advertising capabilities

Facebook’s advertising platform offers targeting and measurement traditional advertising cannot match. Rather than paying for broad exposure with limited tracking, businesses can target precisely and measure performance in detail.

Demographic targeting reaches specific ages, genders, education levels and job roles. Interest-based targeting identifies users engaged with topics related to your business. Behavioural targeting considers actions such as purchase history and device usage. Custom audiences let you upload customer lists and target known contacts. Lookalike audiences find new prospects who share characteristics with your best clients. Retargeting re-engages website visitors who didn’t convert first time.

ProfileTree works with UK businesses to develop Facebook advertising strategies that align with broader digital marketing objectives, so ad spend generates measurable returns rather than reach alone.

What UK advertisers now pay on top of ad spend

From 1 July 2026, Meta charges UK advertisers a 2% location fee on ad spend delivered to UK audiences. The fee is calculated on where your audience sits, not where your business is registered, and it does not appear in Ads Manager only as a separate line item on your invoice. Meta introduced the charge across six jurisdictions at launch: the UK at 2%, France, Italy and Spain at 3%, and Austria and Türkiye at 5%.

The practical consequence is that Ads Manager spend and invoice totals no longer match. Any cost-per-result figure calculated from the dashboard understates the true cost by 2%. If you reconcile ad spend against a finance system, flag the discrepancy now, because without context it reads as an error.

Meta was the last of the major ad platforms to pass digital services tax through to advertisers. Google has done so since 2020. On a £10,000 monthly UK spend, the fee adds roughly £200 a month money that buys no additional impressions.

UK compliance requirements

Running Facebook marketing in the UK means meeting specific regulatory requirements. Getting these wrong can bring fines, reputational damage and campaign suspensions.

Data protection. UK GDPR governs how customer data collected through Facebook marketing is stored and used, including data gathered through lead forms, pixels and custom audiences.

Advertising standards. ASA and CAP Code rules require advertising claims to be truthful, substantiated and not misleading. Platform approval is not compliance: Meta approving an advert says nothing about the CAP Code. Superlatives such as “best” or “leading” are factual claims requiring evidence, and permanent sale pricing is among the most consistently ruled-against practices. The ASA now uses AI-based monitoring to scan social content at scale, and the CMA has held enhanced fining powers under the Digital Markets, Competition and Consumers Act since January 2026.

Age restrictions are changing. On 15 June 2026 the UK government announced a ban on social media use by under-16s, following the “Growing up in the online world” consultation that ran from 2 March to 26 May 2026 and drew 116,211 responses. The first regulations are proposed to be laid before Parliament before the end of 2026, with protections expected to take effect in spring 2027 if approved. Further measures covering curfews and feature restrictions for 16- and 17-year-olds were set out in July 2026. Businesses whose audience skews young should plan for a smaller addressable audience from 2027, and treat spring 2027 as a working assumption rather than a fixed date.

The Online Safety Act reaches further than the platforms. Duties under the Act apply to services involving user-to-user content, which can extend to comment sections and community groups a business operates. Review moderation arrangements for any Page, Group or community you run rather than assuming the duty sits entirely with Meta.

ProfileTree’s digital training programmes cover UK digital marketing compliance in detail, helping businesses avoid costly mistakes while getting the most from Facebook’s marketing tools.

Measuring Facebook marketing success

Likes and shares feel good but don’t necessarily translate into business growth. Effective Facebook marketing focuses on metrics with commercial meaning.

Facebook referral traffic measures users who click through to your site. Lead generation tracks prospects who provide contact details. Conversion rate monitors the percentage of Facebook visitors completing the action you want. Customer acquisition cost calculates what you spend to win each new customer. Return on ad spend measures revenue against advertising costs.

One measurement note for 2026: because the location fee sits outside Ads Manager, build your cost-per-acquisition and ROAS calculations from invoice totals rather than dashboard figures.

ProfileTree sets up analytics to track these metrics properly, giving UK businesses clear visibility into Facebook performance and actionable insight for improving it.

Integrating Facebook into your digital strategy

Facebook works best as part of a wider digital marketing plan that includes your website, SEO, content marketing and email campaigns not as a standalone channel.

Facebook and website integration

Your Facebook presence and website should work together so visitors get one consistent experience rather than two disconnected ones.

Installing a Facebook pixel tracks visitor behaviour and enables retargeting. Social sharing buttons make it easy for visitors to share your content. Embedding your Facebook feed displays recent posts on your site. Cross-promotional content turns blog posts into Facebook content and vice versa. Consistent branding across both creates a professional impression.

ProfileTree’s web design and development services include this kind of integration, so your website and social presence work together to maximise lead generation and conversion.

Facebook’s role in content marketing

Content marketing aims to attract and engage your audience through valuable, relevant content. Facebook serves as a distribution channel for that content and generates content opportunities of its own.

Sharing blog posts drives traffic to your site. Video content produces visual stories that work on Facebook and live on your website or YouTube channel. An educational content series positions your business as an expert resource.

With AI Mode now answering questions from public Facebook content, there’s a new consideration: the public discussions around your brand in Groups, comments and Reels are increasingly the raw material an AI answer is built from. That makes participation in relevant Groups, and clear public answers to common customer questions, worth more than it was a year ago.

ProfileTree’s content marketing services develop strategies that place Facebook alongside other channels, keeping messaging consistent and earning content the widest possible reach.

AI and Facebook marketing automation

Artificial intelligence is changing how businesses approach Facebook marketing, opening up more efficient targeting with less manual effort.

Chatbot integration automates initial customer service interactions. Automated scheduling identifies optimal posting times. Performance prediction forecasts which content types will perform. Audience segmentation uses machine learning to find patterns in your customer base. Creative optimisation tests different versions automatically to identify the best-performing combinations.

Meta’s own Advantage+ campaign tools have matured considerably, and adoption has risen which is part of why auction density and costs have increased across the platform.

ProfileTree’s AI training and implementation services help UK businesses find practical uses for AI in their Facebook marketing, gaining efficiency without losing the human touch that builds real customer relationships.

Choosing Facebook marketing services

Many UK businesses recognise Facebook’s potential but lack the time, expertise or resources to run it well in-house. That creates a decision: manage it internally or bring in outside help.

When to handle Facebook marketing internally

Some businesses manage Facebook successfully without external help particularly where budget constraints make agency fees unaffordable, where the scope is limited to maintaining a basic presence, where strong in-house expertise already exists, or where objectives such as community engagement can be met through straightforward activity.

The value of professional Facebook marketing services

Professional services bring specialists who have run hundreds of campaigns, time saved for the business owner, advanced tools individual businesses rarely access, an objective perspective free of internal assumptions, the ability to scale activity up or down, and a joined-up strategy connecting Facebook to the rest of your digital marketing.

The case has strengthened with the platform’s shift to algorithmic distribution. When reach depends on how well content matches a recommendation system rather than how many followers you have, campaign craft matters more than consistency alone.

ProfileTree’s Facebook marketing services are designed for UK businesses, accounting for local market conditions, regulatory requirements and cultural nuances that affect campaign success.

What to look for in Facebook marketing services

If professional help is the right call, choose carefully. Look for UK market expertise, experience in your sector, proven results and case studies, transparent pricing and contracts, clear communication and reporting, the ability to work alongside your existing activity, a proper understanding of UK GDPR and ASA compliance, and a strategic approach rather than tactics run in isolation.

ProfileTree brings these together, offering UK businesses Facebook marketing services that produce measurable results while supporting broader digital transformation objectives, including web design, SEO, AI implementation and digital training.

Making Facebook work for your business

Facebook remains one of the most powerful marketing platforms available to UK businesses, with unparalleled reach, detailed targeting and real opportunities to connect with customers directly. Success still takes more than setting up a Page and posting occasionally and in 2026 it takes more than it did even a year ago.

Effective Facebook marketing now demands a clear strategy, content strong enough to be recommended beyond your own followers, budget planned against invoice totals rather than dashboard figures, compliance with UK regulations, and integration with your broader digital marketing.

For many UK businesses, professional guidance speeds up results and avoids costly mistakes. ProfileTree’s digital services span Facebook marketing strategy, web design, video production, AI training and SEO, helping businesses use Facebook as part of a joined-up approach to digital growth.

As the platform evolves, privacy regulations tighten and user behaviours shift, the businesses that do well will stay adaptable, keep their practices above board and focus on delivering real value to customers rather than chasing numbers for their own sake.

Whether you’re starting out with Facebook marketing or improving what’s already working, begin with clear objectives, track what actually matters, and adjust based on results.

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