When Mark Lanier and his young client Kaley faced the tech giants in an LA courtroom earlier this year, it seemed a bigger battle than David v Goliath. But they scored a landmark victory, proving that the social media giants had created ‘addiction machines’ that harmed mental health. How did they pull it off? When Mark Zuckerberg walked into a Los Angeles courtroom on 18 February flanked by an entourage bedecked in Meta Ray-Bans, some people laughed. If this was an attempt at product placement…