I'm sorry, but this is UFR. (Utterly... Ridiculous). Friendster just won the patent on social networking.
The idea of interacting with people you know and with people they know is called networking and it has been around long before the internet. The idea that it is patentable is a farce.
Frankly, if Friendster, who lost the social network battle by being slow, closed, and failing to provide user value, actually goes after anyone or takes a dollar from anyone in licensing after getting awarded this patent, that's like winning the World Series on a balk.
Technically, yes, you're allowed to, but if I was managing a team that won the World Series on a balk, I'd turn around and say, "No thanks, we decline the balk. We're not winning that way. Either we actually drive that guy in from third on some sort of actual bat to ball contact or we'll go home, thanks."