Facebook CEO Mark Zuckerberg apparently needs a lesson or two in online security. Now that his Twitter, LinkedIn and Pinterest accounts have been hacked, it's been revealed he was using a very elementary password: "Dadada" was reportedly at least one password Zuckerberg used to log into social media (No special characters! No numbers!).

Engadget reported Sunday that Zuckerberg's Instagram account had also been compromised, but later clarified that the Instagram account hadn't been hacked. The group who claimed responsibility for the hack is OurMine, who tweeted at Zuckerberg's Twitter account (@finkd) after having made their way into Zuckerberg's accounts. OurMine's main Twitter account is suspended and the Twitter exchange between Zuckerberg and the OurMine account have been deleted, but Engadget grabbed some screencaps before the tweets disappeared.

One of the tweets from OurMine read, "Hey Hey @finkd we got access to your Twitter & Instagram & Pinterest, we are just testing your security, please dm us." Zuckerberg replied, "No you didn't. Go away, skids." Good one, Zuck.

NBC News reported that Zuckerberg's Facebook account was not compromised in the hack, and Engadget has speculated that the hack could have been made possible by the massive leak of LinkedIn passwords that happened in 2012.

A Facebook spokesperson told Complex over email that "No Facebook systems or accounts were accessed. The affected accounts have been re-secured."

Given that he's a social media mogul, it makes sense that Zuckerberg would have iron clad passwords, but it really seems like Zuckerberg had his infant daughter choose his password. His Facebook password must be a little better protected since that's his most active account and it didn't get compromised in this hack, so let this be an example to us all of the very real importance of a solid password.