After Facebook officials ignored his bug report, a "white hat" security expert posted the report directly on Mark Zuckerberg's Facebook wall -- using the very same bug he was reporting. This time, Facebook responded swiftly to close the security breach, but said they wouldn't pay the bug-catching bounty such reports normally earn. "Exploiting bugs to impact real users is not acceptable behavior for a white hat," a Facebook engineer wrote in a blog post.

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