Dorian just invited me to multiply which appears to be the latest of the social networking sites (like orkut).
If I know you, and you want an invite, let me know.
I can see how this kind of site could be useful if I were looking for a job, or trying to find someone to fill a position ... but just pinging friends about something like this is probably as effective.
... it's a good excuse for a company to collect a lot of personal information from me, though (and it gives me a chance to check out how the interface was designed, which is always interesting).