thanks for the replies everyone.

@bitkilo
thanks the remark. I should have put in an option for 'other'

@rockBTC
why being so cynic? I'm working towards a master's degree

Thanks for the replies!
II'm not really happy with the last page but I couldn't change it.
Thanks for the tip with facebook ad!

Hello everyone on bitcointalk,

my name is Ralf and I'm currently writing my thesis on Bitcoin.
As a part of my research I'm looking into the Bitcoin usage. After reading that most Bitcoin haven't moved in a year I wanted to know what the remaining part is used for. Therefore I put together a small survey in order to gain some insight. The survey will take about 5 to 10 minutes.

You can find the survey here:
http://kwiksurveys.com/s.asp?sid=c4oaq4hq7fdr26i507772

Thanks for your help!
Ralf