Goodbye FLoC, hello Topics: Google unveils new alternative to cookies

Google has launched a new proposal for a successor to cookies from its Privacy Sandbox initiative, Topics, which replaces its previous proposal, Federated Learning of Cohorts (FLoC).

Both systems are designed to help advertisers target people based on their interests, without identifying specific users, as happens with cookies. Google is set to phase out the use of cookies on its Chrome browser by the end of 2023. Other browsers such as Firefox and Safari, which have much smaller market shares than Chrome, already block third party cookies.

Topics lets a web browser determine a number of interests based on a user’s browsing history over the previous three weeks, with older information deleted. When a user visits a site using Topics, the technology selects three topics, one from each of the previous three weeks, to share for advertising purposes. 

In Chrome, Google plans to provide controls that will allow users to see their topics, remove individual topics, and disable the feature altogether.

Google said that Topics was intended to support similar use cases to FLoC, but had significantly different design and functionality. It does not involve the concept of “cohorts” of users who share common behaviours, and unlike in FLoC, Topics will not make use of sensitive categories such as race or gender. Other differences to FLoC are outlined in a technical explainer.

James Parker, chief solutions officer for data and planning at Jellyfish, welcomed Google’s announcement, while acknowledging it would require a change to the approach used by many brands and agencies.

“Firstly, it’s great to see that Google is listening and adjusting to consumer and industry feedback,” he said. “It’s not the news that some advertisers will want to hear, but this is a step in the right direction for our industry. It will require a refocus on how marketing and agency teams are now organised, as there are a lot of people in the industry who only know how to buy digital media in a certain way and they will need to be retrained.”

Advertisers, Parker said, would likely “react by doubling down on contextual buys and organised plans publisher by publisher. This will impact revenues and potentially limit advertiser reach and increase the prices of the major publishers.”

Google’s methods for enabling effectively targeted ads in the post-cookie world are competing with rival technologies such as Unified ID 2.0, which is led by The Trade Desk and supported by a raft of other ad tech companies. UID 2.0 uses hashed email addresses for advertisers to target individual users.

Last March, Google said that following the demise of cookies, it would not allow technologies such as UID 2.0 that track individual users across its own products, which include buying platform DV 360, publisher platform Google Ad Manager and Adsense. 

While this policy will not stop publishers and advertisers using such tools elsewhere, Tom Kershaw – the chief technology officer of Magnite and chairman of, the organisation operating UID 2.0 – told Campaign Asia last year that that announcement was “a statement in favour of the Privacy Sandbox and against the user login initiative that the industry is pursuing”, but would not actually impact UID 2.0.


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