YouTube reversed its ban of Right Wing Watch, a channel from a liberal advocacy group that posts videos of racism and conspiracy theories promoted by ultra-conservative activists with the idea of exposing them. Google-owned YouTube said Tuesday the ban was a mistake, blaming the large volume of videos on its site. YouTube automates much of its content moderation and it said it sometimes makes the wrong call but it tries to act quickly when a video or a channel is mistakenly removed.

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