I am looking for a fair voting system, where more options are available, and user can select more opinion he is agree with. If more opinions are selected than the weigh of a vote should worth less. Solution should be allowed user to add own opinion, but the organiser (me) should be able to specify the most representative opinions, that are easy to select by other users.
Do you know such a solution? I was thinking about Facebook forums and the Like buttons, but it is not representative, one can give more likes for posts in a topic.
Google Forms is also not a good choice, because user can not add his own opinion. (Google Drive is ugly.)
I searched App Store with 'poll' keyword, but from 3 first hit, only one was alive, and it didn't hit my expectation.