Social Media Authentication: Twitter Estimates That at Least 27 Million Twitter Accounts Are Fake, And That May Be Low

Tim Wu, Please Prove You're Not a Robot, New York Times, July 16, 2017, Sunday Review Section at 8:

"Twitter estimates at least 27 million probably fake accounts; researchers suggest the realnumber is closer to 48 million."

And an important point about Internet reviews:

"Given the degree to which product reviews have been swamped by robots (which tend to hand out five stars with abandon), commercial sabotage in the form of negative bot reviews is not hard to predict.***

"So far, we've been content to leave the problem to the tech industry,where the focus has been on building defenses, usually in the form of Captchas ('completely automated public Turing test to tell computers and humans apart').... [T]he defenses don't actually deter impersonation bots, but perversely reward whover can beat them."

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