I hear all this hype about Diaspora being decentralized, but the only information I can find on their official website and the Wikipedia article is that several people can run Diaspora servers. The main advantages of such decentralization are usually service availability and privacy.
As to the latter asset, the risk I'm worried about is malignant pods, run by data thieves or personal enemies. Is my data encrypted such that only my friends' pods can read it, or is it revealed to other pods as well? Is my data signed, or is there a risk of a malignant pod impersonating me?
When it comes to service availability: in which way does Diaspora ensure service availability? What would happen if a part of the network -- e.g. the diasp.org pod -- went offline?