Even Facebook founder Mark Zuckerberg is not safe from cyber attackers. Zuckerberg’s Twitter, LinkedIn and Pinterest profiles were briefly hacked over the weekend. His Facebook and Instagram accounts were not involved, Facebook officials said. A group calling itself OurMine Team said it attacked the three accounts on Sunday, according to the website TechCrunch. The accounts were quickly restored. Twitter says a Twitter account used by the hackers to post messages was suspended. A website called Engadget captured messages posted by the hackers to Zuckerberg’s personal Twitter account. “We are just testing your security,” said one message posted by the hackers to the billionaire’s Twitter profile. Zuckerberg had not posted anything to his Twitter account since 2012. Business networking site LinkedIn confirmed Monday that the Facebook founder’s data was compromised, The New York Times reported.