Last year, as thousands of women shared their stories of sexual assault and harassment with the hashtag #MeToo, Amanda, a 30-year-old from Oregon, was looking for a supportive place to share her own experiences. Soon enough she was invited by a friend to join a Facebook group for survivors of sexual assault that had thousands of members. The group was easy to find: As recently as this month, the page associated with it ranked higher in some search results than the #MeToo page verified by Facebook.

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