Family with computersWhen her children were ready to have laptops of their own, Jill Ross bought software that would keep an eye on where they went online. One day it offered her a real surprise. She discovered that her 16-year-old daughter had set up her own video channel.

{Kyle and Colleen Reed, with Darren, 13, and Trevor, 11, in Golden, Colo. Mr. Reed monitors Darren’s texting with an app.}