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https://www.washingtonpost.com/.../

twitter-is-sweeping-out-fake-accounts- like-never-before-putting-user-growth-risk/

Jul 6, 2018 ... Rather than merely assessing the content of individual tweets, the company began studying thousands of behavioral signals, such as whether users tweet at large numbers of accounts they don't follow, how often they are blocked by people they interact with, whether they have created many accounts from a single IP address ...

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