Apps like Vonvon.me usually take permissions from users to scan their posts and also on a number of terms and conditions which nobody ever reads. Alarmingly, the list of details which Vonvon.me can access include your name, profile picture, age, sex, birthday, and other public info, your friend list, all your posts, all your photos and the ones you're tagged in, hometown, current city, IP address, info about your device and your education history. Wow, even NSA would be jealous of such a database!
Sadly, that's not all that such apps can do. As per its terms and conditions, Vonvon can store all the data, you just gave it access to, for the priviledge of taking one quiz which tells you what your favourite word is, anywhere in the world without any regard to privacy laws and can even sell your data to third parties and yet not be liable for anything.
A few lines of Vonvon's terms and conditions go like this:
Horrified? Well, we surely were when we came to know about this. If you love doing quizzes, buy a quiz book or just turn to your best friend to tell you all you need to know about yourself!