A tech milestone: Sources tell Bloomberg that 150 million people use Snapchat each day, more than the 140 million who use Twitter each day. Snapchat started out four years ago as an app that quickly deleted photo messages after they were sent to other users, but now allows users to do all sorts of things including send videos and annotated selfies and manipulate images in fun ways (including face swapping)—all of which has gained it a following among young people. Twitter's CEO acknowledged at this week's Recode tech conference that Twitter can sometimes be confusing, while Snapchat is "very modern." (More Twitter stories.)