After two weeks of twists and turns, Elon Musk — CEO of Tesla, richest person on Earth, and a self-proclaimed "free speech absolutist" — has acquired Twitter for $44 billion US. The move has been cheered by some, and raised concerns among others that Musk may remove controls on the platform meant to clamp down on hate speech and harassment. Today, we speak to Kari Paul, a technology reporter for the Guardian US, about what it means for the mercurial billionaire to hold the reins of one of the world's most influential social media sites.