Apps don’t thoroughly check the age of users before giving them access to inappropriate features like video chats with strangers. As mobile apps serve for different functionalities, different types of privacy information may be leaked by users for launching different types of mobile apps. For instance, a location-based service needs to collect user real time location information from users. It may refer to home and workplace where users may not expect to be exposed. A social-aware service needs to extract contacts from users, which violates many users’ personal life as well, not to mention the information collected for function-unrelated purpose. In fact, it is reported that users have growing concern about their privacy while using mobile apps. If you can, however, absolutely consider dro...