VentureBeat has done a good analysis of the mobile social networking space, covering (what it thinks are) the 10 largest most significant companies in the field. MySpace Mobile and Facebook Mobile come out on top, with both companies claiming more visits than the top mobile-only network, Mocospace, which had more than a billion visits in March. The big focus is how the mobile-only networks view the threat of MySpace and Facebook moving onto mobile, with most of them saying they weren’t worried because they offer a better mobile experience—which is what you’d expect them to say. Still, to a large extent it’s true… not every social network user is on MySpace or Facebook, and the same will apply on mobiles. Myspace in particular is very bullish on mobile, saying “mobile advertising has grown in the last six months to be a real business for us” and ”we expect that half of our total traffic will be coming from mobile devices within the next five years”.