21. A system to access trusted UGC, the system comprising: a plurality of social network sites; a registration server having a processor to receive user registration information, the registration information including one or more identities for each user, each identity corresponding to a social network that is facilitated by one of the plurality of social network sites; a crawler that collects UGC and social relationships corresponding to the identities for each user from the plurality of social network sites; a user metadata database including user extended social networks for each user and user privacy preferences, the user extended social networks being created by joining the collected social relationships, the collected UGC being correlated with the extended social networks, wherein an unregistered user is associated with an identity of the unregistered user in the one of the plurality of social network sites; a user content database including the UGC obtained by the crawler; a search engine to filter the correlated UGC according to access rules defined by a requesting user, the access rules being defined in any of the plurality of social network sites of the requesting user; and a display to provide the UGC to the requesting user.
22. The system as recited in claim 21 , further including a subscription server to enable users to subscribe to a service that feeds content, the feeds content being filtered according to the access rules and presented to the requesting user after being filtered.