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if you're familiar with XFN think of findmeon like this: findmeon can let your 'xfn rel="me"' items be anchored to a digital signature. you can then either publish the public key, so that everyone knows for sure that those xfn relations are legit and not spoofed-- or you can not publish the key and have multiple circles/networks of 'xfn rel="me"' documents which are only brought together when someone is provided with a shared public key.