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Just as a thought - facebook must be in a unique position to provide almost unbeatable captchas - just put up images of a known friend and four / forty random pictures - the one who chooses correct is likely the person logged in

ignore this is fb already does it




They do in fact do that (or something like it) when you need to recover an account/password.


They also did this the first time I logged in from a foreign country.




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