Nonsense polls with no real relevance to a factual answer or knowledge are not allowed. These would include "What's your favorite color?", "Who's a better singer X vs Y" or similar survey/polls.
Now, If you're looking to purchase something, and would like to know which people have a better experience with, that would be an allowed type of survey, or perhaps one inquiring which type of food is preferred for an event you may be looking to throw. The more details you can provide on the type of info you need the better.
If you have any further questions or specific incidents to discuss, please don't hesitate to contact support and they'll help you out! :)