Twitter executives have just bought up the company’s stock in what is being interpreted as a show of support for the stuttering social media giant. The company’s co-founder and interim chief executive Jack Dorsey bought more than 31,000 shares of Twitter stock on Monday, totalling $875,000. Dorsey, who holds nearly 22 million shares in the business, announced over Twitter that he was investing in the company and included a link to a receipt of the purchase.