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Preferably both. Not sharing passwords is the obvious one, but if I stop using something I'd like to be able to delete everything related to me (except perhaps logfiles or whatever else needs to be retained for operational reasons up to a few weeks). And without having to call someone on the phone please or email support@ please.

Or getting rid of passwords as a mechanism entirely.

Not that I have a solution, just whining :)

Mozilla Persona, I will suggest.

You're right, though I don't share passwords between services, I'm curious just the same.