Yik Yak under attack in Chilliwack
Students send anonymous messages for everyone to see using the Yik Yak app.
Some call it a tool for cyberbullying. Others say it's a way to share jokes and blow off steam. Yik Yak is an anonymous social networking app that's popular with students, and a concern for some parents and teachers. One Canadian high school, Chilliwack Secondary, decided to block access to the app on school grounds.