Not OP. In page rank you have a graph of pages as vertices and links as edges. In this case you'd want users as vertices and up votes as edges. Page rank would

Not OP. In page rank you have a graph of pages as vertices and links as edges. In this case you'd want users as vertices and up votes as edges. Page rank would give users a high score if they are up voted by other users with high scores. I'm not sure if page rank can deal with negative weight edges for down votes but probably.