In the last one week or so, a number of high-profile social-networking accounts were compromised by hackers. These recently-hacked high-profile social media accounts included Facebook CEO Mark Zuckerberg’s Twitter and Pinterest accounts, as well as accounts belonging to Katy Perry, and Keith Richards.

The high-profile account hijacks are apparently linked to a recent LinkedIn password dump, which includes nearly 117 million stolen usernames and passwords, dating back from the year 2012.

Zuckerberg’s Twitter and Pinterest accounts were hijacked by attackers probably because he failed to heed his company’s first “security tip” for its users --- that is, “Don’t use your Facebook password anywhere else online.”

According to an unidentified person familiar with the hacking incidents, Zuckerberg had used a common password – ‘dadada’ – for logging into his accounts on Twitter and Pinterest social-networking platforms. As such, hackers managed to take over those accounts.

The hacker group – called ‘OurMine Team’ – which claimed responsibility for the hack of Zuckerberg’s Twitter and Pinterest accounts said in a Sunday post on Zuckerberg’s Pinterest page that it was “just testing” Zuckerberg’s security.