A Palestinian white hat hacker named Khalil submitted bug reports to Facebook that allowed him to post on anyone’s wall. Facebook’s security team didn’t take any action so Khalil decided to take matters into his own hands and write about it on Zuckerberg’s wall.
Khalil submitted a full description of the bug in hopes that he would receive $500 in exchange for finding significant vulnerabilities as part of Facebook’s Bug Bounty. After sending it twice he finally got a response emailing saying that it isn’t a bug. He then posted on Zuckerberg’s wall “First sorry for breaking your privacy and post to your wall , i have no other choice to make after all the reports i sent to Facebook team.” Facebook’s security team quickly fixed the bug but said Khalil cannot redeem the $500 reward since he violated Facebook’s terms of service by posting on his wall. OUCH !!