What kind of voting system are you referring to here? I could see the use if you are seeking to have private votes -viewable by certain players or, perhaps GM-only, but otherwise, I would suggest simply asking the players or looking for alternatives, such as the group voting option in facebook or using Gold's suggestion. I can't imagine that too many votes would need to take place each session, and when it comes to making group decisions, I often find groups debating for aeons about what decision they want to make and coming up with a solution.