A video of the attack at the Tops supermarket in Buffalo, N.Y., quickly spread around the internet.Credit…Joshua Rashaad McFadden for The New York TimesPeople searching on Facebook for footage of Saturday’s racist shooting rampage in Buffalo, N.Y., may have come across posts with footage of the attack or links to websites promising the gunman’s full video. Interspersed between those posts, they may have also seen a variety of ads.The social network has sometimes served ads next to posts offering clips of the video, which a gunman live streamed on the video platform Twitch as he killed 10 people. For the past six days, recordings of that livestream have circulated across the internet including on Facebook, Twitter and fringe and extremist message boards and sites, despite some companies’ efforts to remove the content.The pace at which an 18-year-old gunman’s ephemeral livestream morphed into a rapidly proliferating, permanent recording shows the challenges large tech platforms face in policing their sites for violent content.Facebook and its parent company, Meta, rely on a combination of artificial intelligence, user repor …
