SurveyMapper looks like a very useful tool.
This is a free real-time geographic survey and polling tool from the Centre for Advanced Spatial Analysis, University College London. It is currently in beta release. The tool is an example of social simulation resources (part of an academic research project) and is free to use for non-commercial purposes.
There are many polls available (including analytics) but the bonus in using SurveyMapper is the addition of real-time mapping (and the number and choice of map options appear to be still under development). Select a date range to open and close your poll.
The site utilises GoogleMaps and provides some quick sharing options eg via Twitter, Facebook, Delicious, Digg and Reddit to promote your survey.
I experimented with a very quick poll, 'Is your school using mobile devices for mLearning?' (mobile/cell/smart/ phone, iPod, iPodTouch/iPad, or similar) with a simple Yes or No choice to start with but have not promoted it.
I hope to create a more complex poll on a social issue to test SurveyMapper's functionality. I love the combination of a free and easy to use polling tool and visualization of results (via mapping eg. global), charts and geo-codes, all updated in real-time.