Dorsey had already begun to distance himself from the social media platform he co-founded, leaving Twitter's chief executive role late last year to focus on Block, formerly known as Square.

The plan for Dorsey to leave the board has been in place since he stepped down as CEO. At the time, the company noted that Dorsey would stay on the board "until his term expires at the 2022 meeting of stockholders."

However, Dorsey's exit from the board marks the end of an era, as Dorsey has been involved with the company in an official capacity since its founding.

Our guess is that with Elon [no, look at me] Musk thinking about taking over the company, Dorsey has probably thought it is best to get off the train before it is wrecked.