For example: If the theme to discuss is about the abortion, both teams can develop certain polls to support them ideas giving the social opinion about the theme.
http://pollcode.com/ If you want to create some polls, use this page to get online results.
For example http://pollcode.com/pollcode.cgi, you can answer here the question without login and get the results instantly.
So in this case, this page is a very good and easy to use because you don't have to login. And also because you can give your opinion in a privately way.
Maria del Castillo