Twitter and Facebook are all too aware that they’ve been infiltrated by Russia-backed bots. Twitter, for its part, has purged tens of thousands of accounts associated with Russia’s meddling in the 2016 US presidential election. The company also said it would email notifications to hundreds of thousands of US users that followed any of the accounts created by the Russian government-linked propaganda factory known as the Internet Research Agency (IRA), and has said that it’s trying to get better at detecting and blocking suspicious accounts.

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