比赛排名问题 - 如何对多个类别的参赛作品进行排名？

I'm currently developing a video contest web application using Ruby on Rails. It integrates closely with YouTube, which it uses for submitting videos, comments, average rating, and popularity stats. The application will also count Twitter and (possibly) Facebook mentions, and count the number of times visitors have clicked an "Add This" social network button.I'm currently developing a video contest web ap