Palestinian-American model Gigi Hadid has quit Twitter, after Elon Musk, the world’s richest man, bought the social media platform. Hadid is one of the many Twitter users concerned by Musk’s plans for Twitter, with fears that his “hands off” approach to monitoring the site will allow far-right activists to re-emerge. Monitors noted a proliferation in the number of racist tweets on Twitter after Musk took control of the social media giant last month in a staggering $43 billion deal. Hadid is one of many Twitter users who have voiced concerns that online abuse could now become much worse. “I dea…