The only problem I see with your application is that it would be of incredible value to too many of us and if you built it you would actually create a product people would want. What a way to back into millions of dollars.
It would also cause a major increase in hiring as Yahoo and others would have to hire hundreds of thousands of people to write and post enough drivel to somehow try and overpower your algorithm.
By the way, did I mention that I got my season tickets to the Green Bay Packers this year. It is only the 3 game gold package but I could get them now or wait 25+ more years for the 7 game Green package.