On Social Media, No Answers for Hate

Mourners visit a memorial outside the Tree of Life Congregation in Pittsburgh, where 11 people were fatally shot on Saturday, Oct. 29, 2018. On Monday, a search on Instagram, the photo-sharing site owned by Facebook, produced a torrent of anti-Semitic images and videos uploaded in the wake of Saturday’s shooting at a Pittsburgh synagogue. (Michael Henninger/The New York Times)