Speaking of apps, do you realize how much you're giving away when you download an iOS or Android app? Look closely at the terms you're agreeing to. You're granting them the right to gather your name, telephone number, email address, physical location, an inventory of other software you have on your phone, plus any other information that might be contained in the phone's file system, and to sell that information to anyone willing to pay for it.
How many of us would download a program onto our computers if those were the terms?