if I'm in someone's address book, and they use an app that grants the developer full, unfettered access to their address book, I've now had my information given

if I'm in someone's address book, and they use an app that grants the developer full, unfettered access to their address book, I've now had my information given without my consultation or consent to a developer, and I never even knew it was happening. == It used to be "pick your friends wisely" But now, that's before the meaning of the term was of a different sort.