Viraj Puri, a 13-year-old in Great Falls, Va., watched his older brother undergo torment from schoolyard bullies. Now he’s fighting back against that scourge—not with his fists, but by leveraging social media and data analysis to identify hotspots of bullying behavior.

Puri is developer-in-chief of Bullyvention, a website (www. that features a “heat map” of bullying across the United States. The site also includes resources to help prevent bullying, such as links to...

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