Over the past few weeks, the iOS trivia app QuizUp has enjoyed a run close to the top of the App Store charts. The app, which pits user against user in a general knowledge quiz, has come under fire this week over perceived security weaknesses in the way it shares users' data. In a post titled "Our Responsibility as Developers," developer Kyle Richter highlights a number of flaws, many of which could expose both your and your friends' information to random users.

The problem, explains Richter, lies with QuizUp's matching system. Richter is (intentionally) a little vague about how and when information is transmitted, but it appears the app sends "full names, Facebook IDs, email addresses, pictures, genders, birthdays, and even location data" in plaintext over SSL. "I have been able to access the personal information of hundreds of people who I have never met," says Richter.