Twitter co-founder Ev Williams has stepped down from the $24 billion company's board

Kevin Moloney/Fortune Brainstorm Tech

Medium CEO, Twitter co-founder and board member Evan Williams

• Twitter cofounder and former CEO Evan Williams will step down from the public company's board of directors, the company announced Friday.
• "It's been an incredible 13 years, and I'm proud of what Twitter has accomplished during my time with the company. I will continue rooting for the team as I focus my time on other projects," Williams said in a statement.

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