Twitter (TWTR) has accepted a $54.20-a-share buyout offer from Tesla CEO Elon Musk, valuing the social media company at about $44 billion in cash, according to a press release . Once the deal is completed, Twitter will become a privately held company. "Free speech is the bedrock of a functioning democracy, and Twitter is the digital town square where matters vital to the future of humanity are debated," Musk said in a statement. "I also want to make Twitter better than ever by enhancing the product with new features, making the algorithms open source to increase trust, defeating the spam bots, and authenticating all humans." Bret Taylor, Twitter's independent board chair, said, "The Twitter Board conducted a thoughtful and comprehensive process to assess Elon's proposal with a deliberate focus on value, certainty and financing. The proposed transaction will deliver a substantial cash premium, and we believe it is the best path forward for Twitter...