Pop quiz: What is Voxer? If you're scratching your head, it's time to read up on the trendy new social media apps kids are using. Friending your child on Facebook is now just the tip of the iceberg when it comes to online safety. Click through to see some of the sites and apps tweens and teens are flocking to these days, and get useful tips for protecting your child from cyberbullying and other online safety hazards. Have you heard about a new app causing safety concerns? Please share in the comments! Also, check out these 10 apps that can help you monitor your child online.