A Twitter account designed to alert users about racist accounts has been shut down by Twitter. Imposter Buster was a bot created by journalist Yair Rosenberg in an attempt to expose racism on the platform. But while many people welcomed the activities of Imposter Buster -- which would automatically join in the conversations of high-profile racist users in an attempt to expose their trolling of ethnic minority users -- Twitter saw things differently and slapped the bot with a permanent ban. In an opinion piece for the New York Times, Rosenberg explains that the bot he created was designed to…
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