No black eyes involved. But cyberbullying can have bruising, lifelong consequences. Here’s what you need to know. 

Bullying used to take place on the playground or in school hallways: an insult here, a shove there, the occasional black eye. Now there’s a new threat in town: cyberbullying.

This behavior plays out online—in emails and text messages; and on websites, blogs, and social-media platforms, like Facebook, Twitter, Snapchat, Instagram, and WhatsApp.

Cyberbullying can happen at home or at school. It occurs more ...