There are a number of ways, of course. Increasing a counter in the database every time a link is clicked is not all that difficult, really, and seems all that is needed in your case. If you do want to use comments, and want to use “regular comments” as well, it would probably require a bit of applied logic, and perhaps a few lines of PHP oder even an SQL query ot two. What you could do is have your “vote” comments have a fixed name, eg. (that would be set by you via an <input type=“hidden”> field), and only use comments with this commenter’s name. I am kind of brainstorming, really, but I think that’s feasible.