Since late 2011, Facebook has been gradually rolling out its Timeline interface, which puts greater focus on media activity compared with the previous iteration of the Facebook newsfeed. The experiment thus far seems to be successful. According to a report from Simply Measured, as of February, worldwide content engagement on Facebook has gone up by 46% compared with before Timeline. Twitter’s addition of the Discover tab to its navigation menu was also designed to encourage interaction among users and published stories. Read the rest at eMarketer.