 And Twitter co-founder Jack Dussey is stepping down as the company's chief executive officer. He will be replaced by the current chief technical officer, Parag Agrawal. In a statement he wrote about the matter, Mr Dussey said he was grateful for the skill, heart and soul of his successor. He co-founded Twitter in 2006 while Mr Agrawal joined the company in 2011. The Indian has been the firm's head of technology since 2017.