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the need for “an algorithm that delivers the depth and breadth of the content we have on a specific topic and then eventually as it relates to people,” he added.

This is related to Twitter’s larger aim to better organize its content—to separate the interesting and timely tweets from the noise. Twitter has already begun tweaking the timeline where tweets appear—most notably (and controversially), by introducing tweets from accounts users haven’t chosen to follow.

Costolo said that the favorited tweets by other users show up when the user pulls to refresh their timelines twice and Twitter has no new content to show both times.