Groups on social media are a powerful force and powerfully alluring to the sites hosting them. As often in real life, when people get together someplace online, they’re more engaged and spend more time there than they might solo: More engagement, more time. But allowing people to form groups online can be unquestionably dangerous, and they’ve played a role in countless violent events and misinformation campaigns during the past few years. Twitter now is craving social groups, Twitter has set deeply ambitious goals for itself in the next few years after years of diminished expectations and lackluster new features. So why is Twitter adding groups?

