How can I prevent Facebook from using my contacts?

Episode 1032 (1:51:37)

Robert from Palm Springs, CA

Robert wants to install the Facebook and Twitter apps, but he's worried about the apps having access to his address book. Leo says it's best to just say no to that. The apps should ask beforehand, so he should take his time when he installs, and just say no. Twitter does it different on Android, though. It makes him think the contacts are on Twitter by having a check beside all his addressees. And that can be embarrassing when Twitter is harassing them with emails. That's what happened to Leo.