Since ello has prompted the conversation again...what do you think of Diaspora? Is it openid all over again, with the billion different livejournal-clones (and livejournal) that ... agree to agree that everyone exists, but really doesn't allow for cross-propagation of things?
On one diaspora pod, can you friend people on other pods? Does it become as ubiquitous as email? Can you "hop" pods, or are you ensconced once you select where you're going to burn?