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In a blow to Twitter's expansion plans, the micro-blogging platform's Chief Operating Officer (COO) Anthony Noto has quit the company. Noto will join online lender Social Finance (known as SoFi) as CEO. "Noto has been an incredible advocate for Twitter and a trusted partner to me and our leadership team. "On behalf of the entire team, I want to thank Anthony for his passion and his impact, and congratulate him on his new role," Jack Dorsey, Twitter's CEO, said in a statement late on Tuesday.