1. A social networking website system that supports user interactions in a plurality of social networks, the social networking website system comprising: a server that supports the plurality of social networks; a plurality of mobile devices used by a plurality of users, each of the plurality of mobile devices communicatively coupled to the server over a communications network, each of the plurality of mobile devices capable of identifying a current location information; the social networking website system automatically providing each of the plurality of users a membership into at least one of the plurality of social networks based on the current location information obtained from the corresponding ones of the plurality of mobile devices; the social networking website system providing access to messages posted on the at least one of the plurality of social networks to each of the plurality of users; and the social networking website system facilitating posting of new messages by each of the plurality of users employing the corresponding ones of the plurality of mobile devices.