Ariana DiPreta, 15
"Listen to Pandora [a free music-recommendation service at pandora.com]. You choose a song, artist or genre you like and it plays music that's similar. It's really good for discovering new artists.
"One time my mom couldn't figure out how to connect her laptop to the printer wirelessly, so I had to do that. I went to the computer's Help menu. Help really does help."
Marlon Smith Jr., 10
"Hulu.com has all the TV shows. On YouTube I learned how to skip through the commercials: Rate them with a thums-up or -down and they go away.
"The advantage of an iPhone over a BlackBerry is I can put it on speaker and play games while talking to my mother on it. You disable the sound on the game."
Kayla Conway, 15
"For grownups, Facebook is great because you can reconnect with friends from camp when you were 10. But it's really distracting, so watch out. I can think, 'I'll just check one thing,' and half an hour later I'm still on it."
Credits: Gregg Segal (Prop Stylist: Wendy Schelah; Hair and makup for Ariana DiPreta and Kayla Conway: Sylvia Dimaki/Halley Resources; Grooming for Marlon Smith Jr.: Victoria Jacknow)