on your part Clear Cases The next set of apps are those that are uploading your address book but do so only when you initiate an action in the app. We are differentiating these apps from the "explicit warner" apps that present a standard iOS pop-up dialog when you are about to upload contact information. Instead, you'll often tap an element that reads something like "Find friends." In all of these cases, the user is specifically requesting that the app locate people -- though it's not necessarily always clear that your entire address book is being uploaded. There are some obvious examples of apps that use this method. Twitter , Facebook , and LinkedIn are all social apps that can and do upload your address book, though in each case you need to tap a button to make it happen. Gowalla will upload email addresses after tapping through "Find Friends" and "Address Book" without making it entirely clear that you will be uploading that information. Foodspotting is a worse case. Although it does not send any address book information until you tap "Follow People" a few levels deep, it uploads your entire email list in clear text to an insecure HTTP address. The company told Venturebeat it intends to beef up security in the next update. A set of apps that is less obvious is games. We have found that a specific class of games can upload your contact information after you tap a button that is not entirely clear.