I’ve been using Facebook’s new Chat Heads feature on my HTC One for a grand total of two hours. In that time, I’ve become convinced that the concept behind it is bigger than Facebook Home, Facebook Messenger, and could become bigger than even Facebook itself – at least insofar as it relates to smartphone UI design. The quick rundown for those not yet indoctrinated into the new club of bubble-tappers: Chat Heads are floating overlays on your smartphone’s home screen. ...