Maybe if all articles had to be opened to up vote, instead of being able to do it by looking at trending (et al.) and just up voting based on images, titles, and first snippets...
It would guarantee readership, but the added efforts may discourage fluff votes.
Actually, I love that idea. Personally, I have not voted on a post (outside of my own) that I did not open. And I read the whole post nearly 90% of the time. Maybe I'm just a sucker though...lol.