Starting today, the Discover tab will begin to surface content that is even more personalized and meaningful to you. We’ve incorporated additional personalization signals to select Discover stories, including Tweets that are popular among the people you follow and the folks they follow.
Over the coming weeks, we’ll be rolling out this redesigned and more personalized Discover experience on Twitter.com, iPhone and Android.
I always wondered why they got rid of the old feature that listed what people in your timeline recently retweeted. This is a step in the right direction for Twitter, because I care less about what everybody is talking about than what the people I'm interested in are talking about.