Marketing

I went on myspace recently after a six months break. Not much has changed but i noticed something I haven't before. The amount of marketing they do compared to facebook is ridiculous. Things such as movie trailers, products, etc. I wonder how facebook can make money because they barely do any marketing. Then i heard from the radio that facebook has record of everything that their users share, such as photos, information, and messages. I wonder if facebook will ever share or sell these information.