That is what I was going to say about Facebook. Users there are not there to sit and watch long videos of people playing games. The stuff that goes viral on Facebook is usually less than a minute long, skillfully edited, or just downright funny, and easily understood by a large audience.
Right now there is not much of a market for game streams where there is a lot of down time intermittently happening (waiting for the game to load, hiding/healing, etc).
With Facebooks new video service though, I am sure they are going to be going for the streamer to help bring in that crowd as well.