Well, try to absorb the concept navotvolk, as this is how Google and others have made literally billions.... Yedda is a social networking site, as is for example, MySpace; which was purchased by News Corp. for half a billion dollars for the eyeballs it can deliver....
I'm following the business models of social networks, if you want more detailed information. http://howtostartasocialnetwork.com/category/social-network-business-models/
Social Networking, if mastered correctly , can have great results. Come here for some great information on Web 2.0!
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them