Facebook is a social network operated by Meta Platforms, and for media buyers a bundle of advertising placements sold through a single self-service auction. The consumer product covers a feed, short video in Reels, Stories, Groups, Marketplace, Dating and search. The advertising product is narrower: a set of surfaces inside that app where a paid unit can appear, bought through Meta Ads Manager alongside Instagram, Messenger and a network of third-party mobile apps.

The distinction matters because the two have drifted apart. A media plan cannot buy Facebook on its own, and Meta no longer publishes how many people use it. What remains is a set of placements, an auction and a company-level revenue line.

How the buying works

Campaigns run on three levels. The campaign carries the objective and, optionally, the budget. The ad set carries the audience, the optimisation event, the schedule and the placements. The ad carries the creative. Six objectives remain after the consolidation Meta completed across 2021 and 2022: awareness, traffic, engagement, leads, app promotion and sales.

An auction runs for each impression opportunity, triggered when somebody opens one of the apps rather than by a query. According to Meta's Business Help Centre, the impression goes to the ad with the highest total value, a figure assembled from three inputs: the advertiser bid, estimated action rates, and ad quality and relevance. Meta has never published the coefficients, and secondary guides disagree over whether quality multiplies the other terms or is added to them. No total value number appears in the interface. Three proxy columns stand in for it, ranking quality, engagement rate and conversion rate against other ads shown to comparable audiences.

Bid strategies run from highest volume, which spends the budget without a cost constraint, through cost per result and return on ad spend goals, to hard bid caps. Value rules sit on top, adjusting the bid for a named segment by up to 1,000% upwards or 90% downwards, with two criteria per rule and ten rules per set.

The signals feeding estimated action rates arrive by several routes. The Meta Pixel fires in the browser. The Conversions API sends the same events from an advertiser's own servers, surviving browser restrictions that block client-side tags, and the two are reconciled through a shared event identifier so one purchase is not counted twice. Meta made that server-side path a one-click setup in April 2026, removing the developer work that had separated well-resourced advertisers from the rest, and paired it with AI-assisted enrichment of pixel events announced on 15 April 2026.

Placement selection has narrowed. Advantage+ placements, the default setting, lets Meta distribute spend across more than 25 surfaces spanning Facebook, Instagram, Messenger and the Audience Network. Manual selection was the alternative until advertisers began reporting on 25 August 2026 that the control had disappeared, leaving value rules as the substitute. Because the floor on a bid decrease is 90%, a placement can be made expensive to win but not impossible.

On the sell side, Meta is its own publisher for owned surfaces. The Audience Network extends the same auction into third-party mobile apps, whose developers integrate Meta's monetisation software development kit and are paid on effective cost per thousand impressions. Access at scale runs through the Marketing API, versioned several times a year, and since 29 April 2026 through an Ads CLI that gives external AI agents write access to campaign creation.

Origin and evolution

Facebook launched as TheFacebook.com in February 2004 from Harvard University. Advertising followed within months as Flyers, banner units aimed at students at a named campus, later extended into an auction product called Flyers Pro that charged per click and targeted profile fields such as employer, education and relationship status.

The platform advertisers would recognise arrived on 6 November 2007, when Facebook unveiled Pages, Social Ads and Beacon. Beacon reported members' purchases on roughly 40 partner sites back into their feeds without a workable opt-out, drew a class action, and closed in September 2009. A data product had shipped ahead of the permission structure it needed, a pattern that recurs.

Three changes over the following decade built the modern system. Sponsored Stories put paid units inside the feed in 2011. Mobile feed advertising launched in 2012, the year of the initial public offering, moving the business from a sidebar product to the centre of the page. Custom Audiences the same year allowed advertisers to upload customer lists for matching, with lookalike modelling following. The Audience Network opened in 2014, the conversion pixel was consolidated in 2015, and the company renamed itself Meta Platforms in October 2021.

Apple's App Tracking Transparency, enforced from 2021, removed much of the mobile identifier signal underpinning app install and commerce campaigns. The response was structural: server-side event collection through the Conversions API, then automation of targeting and creative under the Advantage+ label, the default campaign shape by 2026.

Disclosure changed too. Facebook monthly and daily active user counts were reported until the fourth quarter of 2023, standing at 3.07 billion and 2.11 billion respectively, according to the company's results for that period. From the first quarter of 2024 only Family Daily Active People was reported, covering Facebook, Instagram, Messenger and WhatsApp together. No official Facebook-only audience figure has appeared since.

Why it matters for marketers

Scale is the argument, and it is made at company level. Meta reported $59.36 billion in advertising revenue for the second quarter of 2026, up 27% year on year, alongside 3.60 billion Family Daily Active People for June 2026. Full-year 2025 advertising revenue reached $196.2 billion, growing 22%. The first quarter of 2026 split $55.02 billion of advertising revenue across the United States and Canada at $23.67 billion, Europe at $13.50 billion, Asia-Pacific at $10.63 billion and the rest of the world at $7.82 billion.

None of those figures isolates Facebook, and neither does the category data. The Interactive Advertising Bureau and PwC put United States social media advertising revenue at $117.7 billion for 2025, ahead of search for the first time, across every platform.

Individual surfaces are disclosed occasionally. Marketplace, launched in 2016, carried 430 million items and 44 million vehicles listed monthly as of July 2026, and reaches one in four young adult daily users in the United States and Canada.

Limitations, criticisms and disputes

Advertising quality is the best documented complaint. Internal documents obtained by Reuters and reported in November 2025 showed Meta projecting roughly 10% of 2024 revenue, about $16 billion, from advertisements for scams and banned goods, alongside a penalty bid programme that charged suspected fraudsters higher rates instead of removing them. Meta disputed the characterisation. The documents underpinned a class action filed by the Consumer Federation of America in April 2026. IAB Sweden expelled the company from membership on 12 March 2026. Account hygiene runs at comparable scale: an analysis by VAB found Facebook banned 3.5 billion fake accounts during 2025, taking the eight-year total above 38 billion.

Signal availability is contested in Europe. Meta introduced consent-or-pay in November 2023, was fined by the European Commission in April 2025 for failing to offer a genuine third option, and appealed on 2 July 2025. Its less personalised advertising option cut the data signals used for targeting by roughly 90%, according to the company's third Digital Markets Act compliance report filed on 6 March 2026. The European Consumer Organisation concluded on 17 March 2026 that the January 2026 interface still failed under the Digital Markets Act, the General Data Protection Regulation and the Unfair Commercial Practices Directive.

Organic distribution has collapsed for publishers. Chartbeat and Similarweb data covering 792 news sites, reported by Press Gazette in May 2024, found Facebook referrals down 50% year on year and 58% below their March 2018 level.

Market power findings diverge by jurisdiction. A United States federal court dismissed the Federal Trade Commission's monopolisation case on 18 November 2025, Judge James Boasberg concluding that TikTok and YouTube compete directly with Facebook and Instagram. European and Latin American authorities have reached different conclusions in adjacent messaging markets, where Italy and Brazil both intervened over WhatsApp during 2025 and 2026.

Not the same as

Meta Platforms is the company. Facebook is one of four apps it reports as a Family, and since 2024 the financial disclosures describe the Family rather than any single app.

Instagram is a separate app with separate surfaces, bought through the same interface. Placement reporting distinguishes them; revenue reporting does not.

Meta Ads Manager is the buying tool. It sells Facebook placements but is not Facebook, and a campaign built in it may never serve a Facebook impression.

Audience Network carries Meta-sold demand into third-party mobile apps. Impressions there are not Facebook impressions, though they are bought in the same ad set.

Recent developments

The app is being restructured around video. Meta said on 24 July 2026 that it would test a version of Facebook opening directly into full-screen video, with the classic feed demoted to a second tab in video-heavy countries, alongside a standalone selling app and a free verification badge. That announcement carried no advertising product news, despite touching three surfaces where advertising already runs.

Regulation reached the product layer in August 2026. A consent judgment entered in the Northern District of California on 26 August 2026 caps teenage use of Facebook and Instagram at two hours a day, blacks both apps out overnight and hides like counts by default, with ten years of payments priced in the exhibits at up to $17.2 billion. A day later, Meta moved Login with Facebook into open beta with one-tap sign-on for returning users on Android and the web.

Timeline

  • February 2004: TheFacebook.com launches at Harvard University.
  • April 2004: Flyers, the first advertising product, appears as campus-targeted banner units.
  • 2006: Registration opens beyond universities to anyone aged 13 and over; Microsoft signs a three-year deal to sell banner and sponsored link inventory.
  • 6 November 2007: Pages, Social Ads and Beacon are unveiled; Flyers Pro adds per-click pricing and profile-field targeting.
  • September 2009: Beacon shuts down following a class action over undisclosed off-site tracking.
  • 2011: Sponsored Stories places paid units inside the feed.
  • 2012: Initial public offering; mobile feed advertising and Custom Audiences launch.
  • 2014: The Audience Network extends Meta-sold demand into third-party mobile apps.
  • 2015: The conversion pixel is consolidated into a single Facebook Pixel.
  • 2016: Facebook Marketplace launches out of buying and selling activity in Groups.
  • 2021: Apple enforces App Tracking Transparency, cutting mobile identifier signal.
  • October 2021: The company renames itself Meta Platforms.
  • November 2023: The consent-or-pay model launches for European users.
  • 31 December 2023: Final published Facebook-specific figures: 3.07 billion monthly and 2.11 billion daily active users.
  • Q1 2024: Reporting switches to Family Daily Active People; Facebook-only metrics are retired.
  • 21 January 2025: Detailed targeting exclusions are removed from ad accounts.
  • April 2025: The European Commission fines Meta over the consent-or-pay design under the Digital Markets Act.
  • 6 November 2025: Reuters publishes internal documents projecting roughly $16 billion of 2024 revenue from scam and banned-goods advertising.
  • 18 November 2025: A federal court dismisses the Federal Trade Commission's monopolisation case.
  • 6 March 2026: Meta's third Digital Markets Act compliance report documents a roughly 90% signal reduction under less personalised advertising.
  • 15 April 2026: AI-assisted Pixel enrichment and one-click Conversions API setup are announced.
  • 29 April 2026: The Ads CLI opens campaign creation to external AI agents.
  • 24 July 2026: Meta announces a full-screen video test that demotes the classic feed to a second tab.
  • 29 July 2026: Second-quarter advertising revenue reaches $59.36 billion; Family Daily Active People reach 3.60 billion for June 2026.
  • 25 August 2026: Advertisers begin reporting the removal of placement controls from Ads Manager.
  • 26 August 2026: A consent judgment caps teenage use of Facebook and Instagram at two hours a day.
  • 27 August 2026: Login with Facebook enters open beta with one-tap sign-on on Android and the web.

Summary

Who: Meta Platforms operates Facebook. Advertisers, agencies and in-house teams buy its placements through Meta Ads Manager or the Marketing API; third-party app developers supply extra inventory through the Audience Network.

What: A social network and, commercially, a set of advertising surfaces including the feed, Reels, Stories, Marketplace, search results, in-stream video and the desktop right column, sold in a per-impression auction that ranks ads by total value rather than bid alone.

When: Launched in February 2004, with advertising from that April and a recognisable self-serve platform from 6 November 2007. Facebook-specific audience reporting ended after 31 December 2023.

Where: Global, with the United States and Canada contributing $23.67 billion of Meta's $55.02 billion first-quarter 2026 advertising revenue, and European delivery constrained by Digital Markets Act obligations that cut targeting signals by roughly 90% for users choosing less personalised advertising.

Why: The app supplies audience at a scale few sellers can match, and the buying system converts that audience into optimised delivery. The open questions are how much of that delivery an advertiser can still direct, given the steady removal of manual controls, and how much of the inventory is worth winning, given the scam advertising and fake account volumes documented since late 2025.