facebook is a social networking site..aimed to kep in touch wid those people dat dont fall in ur best frends category..u can organize events fo a get 2getha..make groups n loads more..
as far as advertisin of otha sites is considered whch was pointed out by sumone..i aint gonna mention da name.. *cough cough
notoriusaman lol.. well..65 million people in da world do facebook..u thnk facebook is gonna hire sumone 2 cme n advertise here???????? ur a funny guy man..u shud try fo the world stands up