The document discusses different business models used by web companies like Google, Yahoo, Facebook, and CyVee. It explains the basic model of offering a free service to users and generating revenue from advertisers or sponsors. It provides CyVee as an example of a social networking site for Vietnamese professionals that uses a model based on a currency called CVD that can be earned for activities and used to access networking opportunities. The conclusion recommends that web service providers be smart with sponsors, nice to users, but not too smart in a way that disadvantages users.