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Ultimately make the social graph a community asset, utilizing the data from all the different sites, but not depending on any company or organization as "the" central graph owner.

A user should then be able to log into a social application (e.g. dopplr.com) for the first time, ideally but not necessarily with OpenID, and be presented with a dialog like, "Hey, we see from public information elsewhere that you already have 28 friends already using dopplr, shown below with rationale about why we're recommending them (what usernames they are on other sites). Which do you want to be friends with here? Or click 'select-all'."

Establish a non-profit and open source software (with copyrights held by the non-profit) which collects, merges, and redistributes the graphs from all other social network sites into one global aggregated graph.