Facebook Pages give public figures, businesses, and other entities a presence on Facebook that isn't tied to an individual profile. The accounts behind those pages are anonymous unless a Page owner opts to make the admins public. You can't see, for example, the names of the people who post to Facebook on WIRED's behalf. But a bug that was live from Thursday evening until Friday morning allowed anyone to easily reveal the accounts running a Page, essentially doxxing anyone who posted to one.

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