As Canada and the world react with grief, empathy and regret to the death of a B.C. teen, some online users are inexplicably still posting hurtful comments about the girl.

Amanda Todd, 15, killed herself Wedneday after years of online bullying despite her changing schools and cities. She posted a YouTube video outlining her struggle to get away from her tormenters.

Sprinkled among thousands of social media condolences are the occasional shocking and nasty comment. The comments are usually flagged as spam soon after they're posted.

"Moral of the story... dont be a slut," posted a YouTube user.

"I dont feel bad. Why did she keep doing things that made people hate her?? What a slut," said another.

Wanda Cassidy, an education professor at Simon Fraser University, said while the negative comments are shocking, they're not isolated. One of her studies found that seven per cent of young people said they cyber-bullied "for fun."

"There is an element in society (young and old) that enjoys seeing someone in pain. Bullying is a wider social problem -- not just a youth problem,"