At issue is the way Facebook moved assets to Ireland
Photograph by Justin Sullivan — Getty Images
By Ian Mount
June 6, 2016

Facebook CEO Mark Zuckerberg may be the work’s biggest social media magnate, but that apparently doesn’t make him impervious to hackers. Several of his social media accounts—but not his Facebook page—were reportedly hacked over the weekend, according the Engadget.

Zuckerberg’s Twitter, LinkedIn, and Pinterest accounts were all briefly defaced on Sunday by a group calling itself the OurMine Team (the group’s own Twitter account has since been suspended), which claimed that @finkd (Zuckerberg’s Twitter handle) was in the LinkedIn database with the password “dadada.”

Zuckerberg’s social media break-in comes hard on the heels of a string of stories that have exposed security weaknesses in the social media world. A week ago, hackers hijacked the pop singer Katy Perry‘s handle, @katyperry, the world’s most followed Twitter (twtr) account. And the previous week, LinkedIn owned up to the severity of a 2012 data breach. It turned out that the LinkedIn (lnkd) hack affected 117 million email and password combinations—not the 6.5 million reported in the past—and the whole batch of them were for sale on the so-called dark web.

 

It’s unclear whether Zuckerberg’s hack was related to the LinkedIn breach and he was making the rookie mistake of using the same, easy-to-remember password over multiple networks. (Microsoft recently outlawed easy-to-remember passwords.) The OurMine Team tweet about Zuckerberg’s presence in the LinkedIn database suggests this might be the case.

On the upside for Zuckerberg, it’s unlikely that anyone believed that the tweets sent out from his Twitter account actually came from him: he hasn’t published anything on Twitter since 2012. Still, it’s safe to assume that the Facebook (fb) CEO is now rethinking his password strategy.

When asked to comment on the hack, a Facebook spokesperson told Fortune that no Facebook systems or accounts were accessed. “The affected accounts have been re-secured using best practices.”

This story has been updated to reflect a comment from Facebook.

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