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By Yasmeen Abutaleb SAN FRANCISCO (Reuters) – Twitter Inc Chief Executive Officer Dick Costolo abruptly announced he was stepping down on Thursday amid increasing scrutiny of the company's slow user growth and inability to attract advertisers at the same rate as its competitors. Costolo will be replaced by co-founder Jack Dorsey on an interim basis. According to a source familiar with the matter, it was Costolo's decision to leave, and Costolo said he brought it up with the board last year as it began talking about succession planning.

By Alexei Oreskovic, Sarah McBride and Malathi Nayak SAN FRANCISCO (Reuters) – After two years of popping up at high-profile events sporting Google Glass, the gadget that transforms eyeglasses into spy-movie worthy technology, Google co-founder Sergey Brin sauntered bare-faced into a Silicon Valley red-carpet event on Sunday. He'd left his pair in the car, Brin told a reporter. The Googler, who heads up the top-secret lab which developed Glass, has hardly given up on the product — he recently wore his pair to the beach. …