It is a web of community, that can be used to speak w/ friends, meet guys, as a message board, more info in www.orkut.com (in english or portuguese)
Right?
Orkut seems to be a lot different than this place, being invite-only. I can't tell much from it's intro page.
Orkut is a big place to meet people, and also NES coders (why not?)
As for invite-only question, I can invite any guy to enter in Orkut!
If you or any one dream enter, send-me a msg w/ a valid e-mail to invitation.