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I would be absolutely stunned if Twitter et al. hadn't already tried this...

I wouldn't be suprised at all. Go find an openly racist account and report them. Two weeks later Twitter will agree with you...but not ban the account

I’ve come to the conclusion after reporting hundreds of obvious spam/racism/hate/etc accounts that twitter just doesn’t care. It increases their metrics and that’s all they want. Makes the share holders happy to see numbers going up and sadly in turn it does increase ad views.

I would be curious to know how this failed, if they did try it. Are captcha automatable? You could make it a bit better by challenging every X actions, and have X decline with a failed captcha.

Captcha has issues in that:

- captcha that isn't hard for humans is often easy to automate

- captcha that is hard to automate frustrates a lot of humans too

- and to add insult to injury you can "automate" the hard ones too by paying like $1 per 1000 captchas or something (think Amazon Turk like stuff)

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