Twitter has rolled out its first non-chronological feature, TechCrunch reports.

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Called “While You Were Away,” the feature operates similarly to the Facebook timeline, highlighting the “best” tweets that occurred while you were off Twitter. The rollout follows Twitter’s preview of the feature back in November.

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“While You Were Away” is not yet live for all users, and Twitter has declined to comment on when it will be. It’s also unknown how the Twitter algorithm chooses which tweets in your feed constitute its “best” content.

Illustration by Nigel Sussman for ReadWrite