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Cook, who became CEO of Apple in August 2011 when Steve Jobs stepped down, is a very private person. Very little is known about his personal life and he has only spoken to a handful of reporters since taking over the helm.

Cook isn't the only Apple executive on Twitter; Apple's senior vice president of Internet Software and Services Eddy Cue and its Senior Vice President Worldwide Marketing Phil Schiller are also on the social network. Those executives rarely tweet, but perhaps Cook will change the 140-character tide.

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