Twitter co-founder Evan Williams steps down from Board after 13 years

Evan Williams is now the chief executive officer of web publisher Medium Corp

Twitter Inc. 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 chief executive officer of web publisher Medium Corp., said Friday in a company filing.

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 chief executive officer, chief product officer and chairman before giving up day-to-day responsibilities in late