I've got some joindiaspora invites. (the "official" diaspora hub which is invite-only for now)
Each one for 2BTC. Let me know if you want one.
Diaspora is decentralised, and consists of multiple "pods" - joindiaspora being one of them. Other pods don't require invites, and users can friend users on other pods. I'll need to dig out the link, but from memory if you go to joindiaspora, follow the link to their GitHub page, then go to the wiki, there's a link to all known pods.
I did this the other day to check out Diaspora, and registered with a different pod just fine. I've got friends on joindiaspora, and I could find them and friend them just fine.
Edit: list of Diaspora pods
. I think I used this one
(it was a throw-away account for testing). It's in German, but my browser automagically translates for me and sign up was easy.