Elon Musk has said running Twitter has been "quite painful" and "a rollercoaster", in a last-minute interview with the BBC. The multi-billionaire entrepreneur also said that he would sell the company if the right person came along. The interview was broadcast live from Twitter HQ in San Francisco, attracting more than three million listeners. Please subscribe here: http://bit.ly/1rbfUog #ElonMusk #Twitter #BBCNews