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Google delays FLoC rollout until 2023

Vivaldi's graphic on FLoC.
Enlarge / Vivaldi’s graphic on FLoC.

Google has delayed its plan to upend web advertising and user tracking by dropping third-party cookie support in Chrome. Most browsers block third-party tracking cookies now, but Google—the world’s largest advertising company—wasn’t going to do that without protecting its business model first. Google’s replacement plan for cookies is a controversial system called “FLoC,” but after many big Internet players came out against the idea (and the EU launched an antitrust investigation into the plan) Google now says “it’s become clear that more time is needed across the ecosystem to get this right.” The new timeline pushes back the death of third-party cookies by about a year and a half.

Back in January 2020, Google announced a plan to drop support for third-party cookies in Chrome “within two years.” The Chrome “Privacy Sandbox” would block the third-party cookies typically used for ad targeting, but given Google’s multibillion-dollar ad business, “not tracking users at all” is not an option. A replacement tracking system called “FLoC,” or “Federated Learning of Cohorts,” was the primary alternative floated by the Chrome team. The simple FLoC explanation is that, instead of having individual companies hide a third-party cookie on your computer that tracks what websites you visit for ad interest tracking, Google would now have Chrome build an ad profile locally on your computer, then ship that profile to advertisers whenever they ask. Google says this plan is better than third-party cookies because it will take individual identification out of the ad-tracking process by combining people into groups, though many opponents of the idea have disputed this.

Google's infographic on how FLoC works.
Enlarge / Google’s infographic on how FLoC works.

Everyone who isn’t an advertising company seems to have come out against FLoC. The EFFBrave, Vivaldi, and DuckDuckGo have all put out strong statements against the idea. Meanwhile, other browser vendors—like Apple, Opera, Mozilla, and Microsoft—have floated more tepid “no plans to implement” statements. Amazon is already blocking FLoC on,, and Zappos.

Google says it has received “substantial feedback” from the web community after its first trial of FLoC, and now it’s going to take things a bit slower. Google says this delay will “allow sufficient time for public discussion on the right solutions, continued engagement with regulators, and for publishers and the advertising industry to migrate their services.” While FLoC is Google’s primary pitch for a user-tracking ad cookie replacement, it’s not the only plan. The company says “Chrome and others have offered more than 30 proposals, and four of those proposals are available in origin trials.”

The new timeline commits to a public development and testing period, with “Stage 1″—the completion of testing and the launch of user tracking APIs—happening in late 2022. Stage 1 will last for nine months, giving publishers and the advertising industry time to migrate their services. “Stage 2” starts in mid-2023, when Chrome will phase out support for third-party cookies over a three-month period. Again, not tracking users at all—which is the stance other browsers have taken—does not seem to be on the table here. Google says that, in the future, a more detailed schedule will be kept up-to-date on

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