zlacker

I'd look at how different users respond to different articles? Do they click on the article? Do they comment? Do they come back to the site after they see the article? Do they vote for the article.

Next, you can correlate how various people voted with whether a specific person will like the article and/or comment. Finally, you should be able to tell who will like or not want something to get voted up. At this point, you can customize for everyone or weight the influence of people based on well correlated their taste is with the top karma people.