First revealed as part of Twitter's November 2014 platform update and formally announced on January 1, a new 'while you were away' feature is now officially available to all users of Twitter's mobile app for iOS and Android, appearing at the top of users’ timelines.
The micro-blogging startup explained in a blog post Wednesday that the feature surfaces a few of the best tweets “you probably wouldn’t have seen otherwise,” as determined by engagement and “other factors.”