Walmart has changed its store PA systems in the wake of a prankster using it to broadcast offensive remarks. The Philadelphia Inquirer had several stories about this; for full article please use the link.
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[PA fixed]The prankster, a youth, has been arrested. [TV news reports not shown said he was facing up to two years hard time in state prison for the prank.]
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[arrest of culprit]"Social media" contributed to the apprehension.
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[social media helps find prankster]