Evan Williams also announced the move in a series of tweets.
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 officer of online publishing website Medium and had also served as the CEO of Twitter."I'm very lucky to have served on the @Twitter board for 12 years (ever since there was a board)
It's been overwhelmingly interesting, educational-and, at times, challenging," he tweeted.
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