An anonymous hacker gained access to Facebook CEO Mark Zuckerberg's fan page. Instead of using the page to wreak havoc, he or she took the opportunity to pitch an idea of letting Facebook users invest in the company:
Let the hacking begin: If facebook needs money, instead of going to the banks, why doesn’t Facebook let its users invest in Facebook in a social way? Why not transform Facebook into a 'social business' the way Nobel Prize winner Muhammad Yunus described it? http://bit.ly/fs6rT3 What do you think? #hackercup2011

1,803 people liked the update before Facebook took down their CEO's fan page. At the time of writing, Facebook has not made a public statement about how the hacking was performed.

Celebrity social networking pages are often managed by a marketing team, meaning the account can be accessed by many different users with many different passwords. Naturally, this puts the account in question at a greater risk than an account used by just one person. We hope that this is simply a case of the hacker talking, bribing, or tricking the right person, and not an actual security flaw that can be used to gain access to anyone's fan page.