The European Commission accused TikTok on Friday of failing to prevent its recommendation algorithm from drawing users into “rabbit holes” of content about sadness, self-harm and body image. The preliminary findings that TikTok violated the EU’s Digital Services Act (DSA) come amid focus on both sides of the Atlantic on whether and how social media platforms are endangering young users.  European officials said their findings were the first time EU regulators have directly challenged the engag...