An unemployed Palestinian developer named Khalil Shreateh tried several times to report a bug to Facebook's security team. When no one got back to him, he took the (dubiously) logical next step: exploited the bug to leave a public comment on Facebook CEO Mark Zuckerberg's wall.
"First sorry for breaking your privacy and post to your wall," an apparent screen shot of the hack reads. "I has (sic) no other choice to make after all the reports i sent to Facebook team."
The break-in, detailed on Shreateh's blog (and in several agitated posts from Facebook developers on Hacker News), has been more than a little embarrassing for Facebook.