Sometimes it’s a sudden influx of people they don’t know leaving laughing reactions on their public posts. Other times strangers lash out with hateful comments. In the most serious cases, they’ll randomly receive a threat from someone they’ve never met or interacted with online. Though the attacks vary, they’re all directed at transgender people, unwitting targets of transphobic Facebook groups. Kiwi Farms, a message board popular with far-right trolls, recently conducted a campaign of terror against a Twitch streamer and transgender activist that led to the site being taken down. But mass harassment is far from a fringe phenomenon. Facebook,...