Generally a website (ex: facebook
) where people can add "friends", (generally people they may see once a day and never communicate with in person, or close friends they actually do associate with) and communicate with them through multiple ways such as leaving comments on posted pictures or blogs, or perhaps sending them a message they can read when they sign into the site at a later time.
Guy 1: I just joined a social networking site! It pwns!
Guy 2: Yeah right, social networking is the gayest thing to happen to Earth since reality tv.