Over the Summer, Facebook launched its Questions feature to a small number of users; now it's finally available to everyone. The feature allows users to ask their friends' opinions on a topic and see the results in an easy-to-read display.
Questions are easy to ask and easier to answer; you can agree with an existing answer by clicking (essentially to "vote" for that response), making it simple to see popular responses. And they spread far: friends of friends who respond to your question will also be able to answer — but you'll see your own friends' responses first.
Questions hasn't been pushed out to everyone yet, but you can access it if you upgrade your own account.