Four Facebook Alternative Alternatives

Now that Diaspora, which is building an open-source distributed social network, has launched in private alpha, I figured it'd be a good idea to remind you that there are several alternatives to that particular Facebook alternative, some of which have been around longer and in more advanced stages of development.

Note that there may be more initiatives that I haven't heard of or simply didn't or forgot to mention, so this is by no means an exhaustive list. Also, all of these deserve a full review, so I refrained from making quick-and-dirty comparisons between all of them.

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