A 12-year-old Wisconsin girl is recovering in the hospital -- after two of her friends stabbed her 19 times last weekend.

The girl's classmates are being charged with trying to kill her.

The 12-year-olds told detectives the attack was an attempt to please "Slender Man," a fictional character they found on a horror website.

The character preys on children -- and has taken on a life of its own online.

This is, of course, prompting parents to look even closer at what their kids are accessing online and talk about it.

We were joined Friday evening by Jesse Weinberger, an Internet safety expert and the author of "The Boogeyman Exists: And He's in Your Child's Back Pocket."