The young hacker goes by Jani (could be his real name... or could be a top-secret alias!) and the bug he found allowed user's to delete anyone's Instagram comment. Yep, ANYONE'S. As Jani said, that included: "Even Justin Bieber."
While the issue was fixed back in February, this isn't even Jani's first bug discovery! Facebook revealed to Forbes that the little genius discovered other glitches with his twin brother's help in the past, but they were too small to get a reward.