It's difficult to be a parent in the digital age. Your kids probably know more about the Internet than you do (you can undo sent emails now?), and they're using gadgets and apps you've never heard of (what's a Whisper?).

There's simply no way to keep kids off the web, or to keep smartphones out of their little hands. Instead, arm yourself with knowledge: How are "kids these days" interacting with tech, and how worried should you be?