Twitter co-founder and one-time chief executive Evan Williams is stepping down from the board, leaving the one-to-many messaging service to focus on "other projects." Williams will depart the Twitter board at the end of this month, according to a filing with the US Securities and Exchange Commission on Friday. "It's been an incredible 13 years, and I'm proud of what Twitter has accomplished during my time with the company," Williams said in the filing.

Williams throttled back his role in the San Francisco-based startup eight years ago, turning his attention to a new endeavors including creating popular online publishing platform Medium.

Copyright Agence France-Presse, 2019