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Am I the only one who thinks this is absurdly complex analysis for a pretty simple concept? Your profile should include your contacts and the data you need. The platform you choose to express that profile depends on the services you use most and is optimized specifically for them. You may be really into photo and video, while I'm into blogs and podcasts and events. So we choose different apps, but interact with the same services on different levels or rates. Oh yea, social graph this and network that and blabity blabity blah!

-M