I have only been on Orkut for less than two days and I am already addicted. It is fun to build up a network and surf the people. The novelty is certainly a factor, I imagine things will slow down once I stop adding people that I know, but I am still enjoying it. I understand that the concept of a social networking site is nothing new, but this is the first time I have cared to join one. I think that this is because the site is invitation only. It is hard* to get in. So it has value, the other sites did not.
Orkut is very slow.
If I know you and you want me to invite you to Orkut, add a comment.
[Update 5 June] Orkut have made some infrastructure changes overnight and now it is fast