Sort:  

We don't, but that's something we're looking into. Step by step.

When two accounts both upvote each others comments within a minutes, over and over it can't be hard to detect.
See accounts ghazanfar.ali and leopard0505 comment history. Both are commenting on an article with a minute of each other and upvote each others comment, no way that is just automatic upvoting, it's clearly the same guy. That has to be a way to detect such obvious fake account upvoting