Recently checked out a couple of "social-networking" toys, namely Orkut and Yahoo! 360. I can't really see the point of keeping a "public" blog on either of them, because only members of those two communities can see it. And Orkut seems to be very heavily weighted towards dating. Especially if you want to date Brazilians. On the other hand, Linked-In seems to be having a surge lately. I had a couple of former colleagues reconnect through Linked-In, and a bunch of my current coworkers suddenly seem to be getting networked that way. Downside there is that functionally illiterate recruiters keep contacting me.