YouTube has posted a retrospective for 2014 called YouTube Rewind: Turn Down for 2014. Professionally filmed and produced, the video features mainstream celebrities like John Oliver, Stephen Colbert, Jimmy Kimmle, Chris Hardwycke, Chris Hardwick, Conan O'Brien, and Big Bird. But it also includes many folks who have become celebrities through YouTube itself, including The Fine Brothers, Kid President, Corridor Digital, iJustine, Freddie Wong, AmazingPhil, Grace Helbig, Enjoy Phoenix, Epic Rap Battles, and many more. The music is mostly a mashup of Pharrell's "Happy" and various other songs that have been popular on YouTube, and it was put together by DJ Earworm. It's a great video. It's funny, clever, well-made, and entertaining.
Check It Out: YouTube Rewind 2014 Features John Oliver, Stephen Colbert, Myriad of YouTube Stars