Khalil Shreateh is a Palestinian IT expert and white-hat hacker who gained international attention in 2013 by bypassing Facebook's security to post on Mark Zuckerberg’s wall. After failing to get a response from Facebook's security team regarding a, he used the exploit to prove its existence. 

Key details about Khalil Shreateh:

• The Bug: Shreateh discovered a vulnerability allowing users to post on the private walls of anyone, regardless of friend settings.
• The Action: After being told by a Facebook engineer that the issue was "not a bug," he posted directly on Mark Zuckerberg's timeline to demonstrate the flaw.
• Outcome: Facebook fixed the bug but initially refused a cash reward, claiming he violated their policies.
• Recognition: A crowdfunding campaign was subsequently created to reward his efforts, which raised over $10,000. 

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