AskFM, Kik, What’s Goodly, Slingshot. If these apps don't sound familiar to you, there's a good chance they do to your kids.

Facebook, Snapchat and Instagram are guaranteed to be on almost any teenager’s device, but it doesn't stop there.

Hundreds of social media and messaging apps are available, and their popularity can change by the week.

"I think the apps that have risen in popularity where we see more problems are apps that encourage anonymity,” Dr. Elizabeth Englander said.

Englander studies the effects of cyberbullying at Bridgewater State University. She says it's very easy for kids to be mean on anonymous apps like Afterschool or AskFM.

Englander says it's nearly impossible to track everything your child is doing on their device...but you should talk to them about how they are interacting and who they are interacting with... And keep a watchful eye about changes in behavior that could be related to cyberbullying.

"Signs that your child is having some sort of social problem.  For example maybe they stopped talking about their friends or they seem to stop seeing their friends,” Englander said.