Topics API to replace controversial FLoC 

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“It is yet to be seen whether this next iteration is workable, given how high level and short-time-spanned it is. Google’s FLoC received negative policy and industry feedback, and there was concern that FLoC IDs

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could have been exploited for cross-site user tracking. With the release of Topics API, Google is providing a higher level of user obfuscation and localized browser storage vs. a centralized storage location.”

Why use the Topics API

The Topics API is a similar, but more abstract concept than FLoC. Chrome identifies a few of your top interests to represent your browsing habits every week. For example, these interests can be general things like business, travel, or exercise.

If a website has opted-in to participate then Chrome selects only three topics or interests to share with its ad partners. Advertisers use these “Topics” to decide which ads to send your way. If exercise is one of your interests, you will probably see some exercise ads.

Topics are only stored for three weeks. And then they are deleted. The process occurs on your device rather than on external servers. The topics are a Google-curated list of 300 interests.