SAN FRANCISCO (Reuters) - Twitter CEO Dick Costolo lobbied against exiling Executive Chairman Jack Dorsey in a 2008 power struggle, according to an early investor who shed new light on the management turmoil that for years roiled one of Silicon Valley's drama-ridden companies. Chris Sacca, a former Google executive turned investor, said Costolo - another Twitter investor in 2008 - urged the board to keep hold of Dorsey, who is widely credited with inventing the 140-character messaging service. ...

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