Is it okay to ask for surveys here?
I am looking for surveys indicating the percentage of Frenchmen who are in favor of allowing UberPOP in France.
Yes. In fact survey data can be very structured and scientific. For example,
Pew Research Center is a
conduct[s] public opinion polling, demographic research, content analysis and other data-driven social science research.
(Fancy ways of saying 'survey'.)
They offer raw data that is used in their reports, and this kind of resource may be useful for answering OpenData questions about polling, surveys, etc.
I would say yes because your question can easily be rephrased without asking for a survey, and you could get a survey as an answer:
I am looking for data on the percentage of Frenchmen who are in favor of allowing UberPOP in France.
[Added] Who knows what other data can pop up on the subject instead of just surveys. Maybe someone followed peoples' taxi behavior and found out how many switched to Uber ;-)