FILE PHOTO: Twitter co-founder Evan Williams speaks on stage during TechCrunch Disrupt SF 2012 at the San Francisco Design Center Concourse in San Francisco, California September 12, 2012. REUTERS/Stephen Lam/File Photo

(Reuters) – Twitter Inc said on Friday one of its co-founders, Evan Williams, will be stepping down as a member of its board at the end of the month.

Williams, who also announced the move in a series of tweets, is currently the chief executive

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