Tesla CEO Elon Musk is offering to buy Twitter, a swift turn just days after deciding not to join the social media company's board of directors. Twitter Inc. said in a regulatory filing Thursday that Musk provided a letter to the company the day prior with a proposal to buy the remaining shares. The 50-year-old business mogul, currently the richest man in the world, already has 9% stock of Twitter – making him the biggest shareholder. In the Wednesday letter, Musk offered $54.20 per share of Twitter's stock, which comes out to $41.3 billion, and said that would be his final offer. Head to the link in bio to read more. #elonmusk #twitter