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I'm guessing most people try to obtain the same username on every service, so generally it's not hard to trace people's other identities. And some people, inclu

I'm guessing most people try to obtain the same username on every service, so generally it's not hard to trace people's other identities. And some people, including myself, are happy to have all their identities out there.

pornel 5y ago
It's also possible to correlate the shape of the social graph across services to deanonymize users across social networks. So I don't think not proving ownership of multiple identities buys much for anonymity. For deanonimization just a reasonable probability is sufficient. But a proof adds more utility to the person proving their identity. You can still have hidden throwaway accounts when needed.