A backlash campaign against Facebook over its Cambridge Analytica data leak of 50 million users’ personal information just gained a high-profile participant.

In response to challenges on Twitter, Tesla and SpaceX CEO Elon Musk shut down the two companies’ Facebook pages Friday.

Facebook is facing lawsuits and calls for CEO Mark Zuckerberg to testify before Congress over data-miner Cambridge Analytica’s use of Facebook users’ personal information without their permission, which has been linked to the campaign of President Donald Trump. What Facebook CEO Mark Zuckerberg called a “major breach of trust” spawned a social media campaign for Facebook users to delete their accounts.

Musk, head of Palo Alto electric car maker Tesla and southern California rocket company SpaceX, was asked on Twitter whether he would delete his two firms’ Facebook pages.

“It is time. #deletefacebook,” WhatsApp co-founder Brian Acton tweeted to Musk on Tuesday.

After at first — presumably in jest — denying knowledge of Facebook, Musk on Friday was asked by another user whether he would delete the SpaceX Facebook page.

Soon after, the official Tesla and SpaceX pages on Facebook, each with 2.6 million “likes,” were down. All that remained were “Sorry, this content isn’t available right now” messages.