I also think both terms are being used synonymously.. Here is a definition of differences between poll and survey:
A poll is as one-time, simple and quick question where users can usually respond with one mouse click. Sports and news sites are good examples that displays polls on their main pages. Surveys or questionnaires are more comprehensive forms that may include many types of questions and format types that are designed to extract information from the user in the most efficient way possible.http://www.prezzatech.com/faq/faq-2-difference_survey_poll.asp