Social network Bebo, based in San Francisco but bigger overseas, has hired a bank and is looking to sell, a source tells VentureBeat. A Bebo spokesperson, however, says the social network is just looking to get more funding. Judging by Compete's domestic numbers, now might be a good time for the social network to sell. The site has grown over 50 percent since November 2006, but growth has turned flat since the start of fall.