Silicon Valley has been rocked by news that the CEO of Twitter, Dick Costolo, will be stepping down from his post in early July. The social network has been haunted by controversy for the last few years as they have struggled to tackle bullying and trolling.

Despite the fact that many investors have called for a change of leadership, Costolo insists that the decision to transition out of the top role is his own and that he will remain on the board of directors. He will be replaced by interim chief executive Jack Dorsey, the company’s co-founder.

In 2013, Twitter appeared on the New York stock exchange, but results have been disappointing and in April the company did not meet Wall Street’s forecasts, leading share vales to fall to below their 2013 debut price.

Mr Costolo said “I am tremendously proud of the Twitter team and all that the team has accomplished together during my six years with the company.”

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