Like many others, I've been paying attention to Orkut in the last couple of weeks. I've answered more requests to be "friends" on Orkut then I have of any of the other half-dozen Social Networking Services I've tried, and I've looking at other people's friends to see if I know anyone. I've yet to ask someone to join Orkut that wasn't already a member, and I've been careful to not have anyone as a "friend" that I didn't know reasonably well and I thought knew me.