If you're smart enough to get code from github working on your own box, paranoid enough to worry about facebook's control of your data and be interested in an alternative, and savvy enough to get wind of such an early release, I don't think you're going to put anything that sensitive in this network!
They don't seem to be publicizing it, but there's a live version up at a subdomain of joindiaspora.com, which people are sharing on diaspora's facebook page. Won't link here because of the concerns above and because it's creaking under the load already.
