That's actually a very good question, I haven't thought about any YouTube competitors for a long while - seems like their hold has just got bigger and bigger really. I can't see Vimeo/Dailymotion making any kind of real dent in YouTube's segments. I can't see the fun in Twitch but that's because I can't really bother to watch livestreamers. I do just watch most of my stuff on either YouTube or via Facebook's video option thing. That's the only real competition I can think of actually.