Diaspora announced that private alpha invites are now being sent out. The invites are being rolled out slowly, first to those who donated to the project through Kickstarter, followed by people who've requested them at joindiaspora.com, which's the main website for the operation. Diaspora.com, at the moment, is still an ad-ridden, cash-parked domain masquerading as a "luxury travels" site.
"Diaspora lets you create "aspects," which're personal lists that let you group people according to the roles they play in your life. We think that aspects are a simple, straightforward, lightweight way to make it really clear who's receiving your posts and who you're receiving posts from. It isn't perfect, but the best way to improve is to get it into your hands and listen closely to your response."
Please note that Diaspora isn't sending out invites to a new social network that can immediately replace Facebook accounts. Diaspora is sending out invites for people to test the alpha version of the code residing on the official test "pod" that's being run by the Diaspora team.