Mark Zuckerberg's social media accounts got hacked after he made a basic security mistake

facebook ceo mark zuckerbergFounder and CEO of Facebook Mark Zuckerber gives his speach during the presentation of the new Samsung Galaxy S7 and Samsung Galaxy S7 edge on February 21, 2016 in Barcelona, Spain. The annual Mobile World Congress will start tomorrow and will host some of the world's largst communication companies, with many unveiling their last phones and gadgets.David Ramos/Getty Images

Even billionaire tech entrepreneurs get hacked.

Some of Facebook CEO Mark Zuckerberg's social media accounts were hijacked late on Sunday, with the attackers posting messages from them showing off their access.

The hacker(s) - who use the name OurMine Team - managed to get into Zuckerberg's Twitter and Pinterest accounts, and also claimed to have broken into his Instagram account, although Facebook denied this to VentureBeat, and there doesn't seem to be any evidence of it.

(His Facebook account wasn't affected.)

How did the attackers get in? It looks like Zuck made a basic security mistake: He reused the same passwords.

Back in 2012, professional social network LinkedIn got hacked. The hack was back in the news again recently as the full scale of the hack finally came to light - more than 160 million accounts were compromised.

This old LinkedIn hack seems to be what made the hack of Zuckerberg's accounts possible. "Hey, [Mark Zuckerberg]," one message sent from his Twitter account reads. "You were in [the] Linkedin Database with the password "dadada" ! DM for proof.."

The implication is that the 32-year-old CEO reused this password on Twitter and Pinterest - and the hackers got in that way.

Zuckerberg isn't a big Twitter user. His last tweet was sent in 2012, and the rogue tweets sent by the hackers have since been deleted.

Don't want to make the same mistake as Zuck? Security experts recommend that you use a different, strong password for each account you have. That way, if one of them gets compromised, the others aren't too. If it's difficult to remember all the passwords, then use a password manager.

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