Elon Musk will join Twitter‘s board of directors after taking a 9.2% stake in the social media company, according to a release filed with the SEC.

“Through conversations with Elon in recent weeks, it became clear to us that he would bring great value to our Board,” Twitter CEO Parag Agrawal said in a tweet.

“He’s both a passionate believer and intense critic of the service which is exactly what we need on Twitter, and in the boardroom, to make us stronger in the long-term,” he added.

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