iOS (Jailbroken): One of the quirks of the iPhone is that apps can access your personal information, including your contacts, without you knowing about it. If this bothers you, ContactPrivacy is a tweak that sends an alert when apps start digging through your address book.
ContactPrivacy sits quietly in the background until an app attempts to access your address book. If an app does, ContactPrivacy pushes out an alert that gives you the chance to block access. However, blocking access to your address book will cause some apps not to launch at all, so be careful with what you choose because there’s no way to restore access without uninstalling ContactPrivacy. You can find it by searching for Contact Privacy in the Big Boss Repository.