That's because I wasn't able to administrate enough qualitative questionnaires in order to get relevant findings. Asking open questions to people wasn't the most efficient way to sustain my hypothesis. I really need a global opinion :) And actually, even if I have not a lot of answers for now, a lot of interesting trends are emerging. That's really interesting because my hypotheses are almost all validated by the results of the survey :) Furthermore, according to my academic supervisor, my best option was to use multiple choice questionnaires. And because he is the one that will evaluate my paper, I do not question his authority ^^ But I agree with you, a lot of internet surveys are completely useless because people just answer anything and try to complete the questionnaire as fast as possible. But I don't believe than the modding community will act this way Anyway, thanks again to everybody who helps!