I'm surprised there wasn't already a thread about this, but Alex Day is a popular youtube and musician and he got invited to be a housemate but turned it down (understandably, seeing as he's got a book coming out)
But it does mean that there is probably a good chance the producers are fishing out other Youtubers for housemates.
He starts talking about it at 7:46
Interesting though. I know a couple of people on Youtube I think would be good housemates.