Mark Zuckerberg, the CEO of Facebook Inc ( FB ), has had his Twitter Inc ( TWTR ), Pinterest and LinkedIn Corp ( LNKD ) accounts hacked.

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The hackers gained access to Mark Zuckerberg’s accounts on Sunday, but only had control for a short time. However, in this period the accounts were defaced and a group going by OurMine Team claimed responsibility for the hacks.

One of the hackers claimed that they got the information to hack Mark Zuckerberg’s accounts from the LinkedIn database leak last month. The Facebook CEO may have used the same password for multiple services, which could be how they gained access to them, reports TechCrunch.

The hackers revealed that the password that was used by Mark Zukcerberg for his LinkedIn accounts was “dadada.”

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