Quite a nice tutorial giving you a good start.
http://tutorialzine.com/2010/05/show...ts-jquery-yql/
or using the Addthis api
http://www.addthis.com/developers to get all the social media in, then just add in comments.
Sort by custom query, add code to the loop and functions to get the chart effect in the posts 1-50 countdown sort of thing.
People like to vote on stuff and if you're getting se exposure on it lovely.