If you are using the "Javascript" or the "Inline Frame" HTML version of the micropoll, users who have taken your poll will automatically view the results page when they come back to your site. A small cookie is placed on the end-users browser when they take the poll.
However, if you are using the "Source HTML" version users will be able to take your survey multiple times. The "Source HTML" is the least preferred option between the three options for adding a poll to your webite. This is one of the drawbacks.
Currently with MicroPolls, we do not share the IP addresses or domains of end-users.