San Francisco — Twitter co-founder Evan Williams will step down from the company’s board at the end of February. “It’s been an incredible 13 years, and I’m proud of what Twitter has accomplished during my time with the company,” Williams, 46, now CEO of web publisher Medium, said on Friday. Williams, Jack Dorsey and Biz Stone started the San Francisco-based social media company in 2006 that is known for its original 140-character limit on messages. He served in various roles, including CEO, chief product officer and chairman before giving up day-to-day responsibilities in late 2010. He started Medium in 2012. Twitter went public in 2013. Williams, in a tweet, thanked Dorsey and Stone for “starting this crazy company with me — and continuing to make it better and better”. The company has suffered from comparisons with Facebook, and at about 321-million monthly average users, has far fewer users than the social-media giant. Dorsey, who had left the company, returned as CEO in 2015. To...

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