Elton Castee has 1.2 million followers on Vine, the six-second looping video platform that launched the comedian to Internet stardom. But the top of his profile has a message for fans in capital letters: All of his videos are now on his Facebook page, too. Three years after it burst onto the scene to create a new breed…

Digital media Vine star Nash Grier has left WME to sign with UTA, The Hollywood Reporter has exclusively learned. The 18-year-old rose to fame on Vine, where he has 12.5 million followers and his micro-videos have been viewed (or “looped”) more than 3.35 billion times. His other current social media tallies include 8.8…