[fromhet]

But that would need a constant growing userbase, otherwise new (and not neccesary better) would get a favor. In the system that 1 upvote === 1 point old links get a favor.

If upvote===1 point and downvote===-1 point old posts would get a head start (from being in the top lists) but it wouldnt be that hard for a competing link. Bad links would quite quickly get low rankings though.

An important thing to note is that this isn't a social news site (as reddit or HN) but a social link sharing site, and thusly doesnt need to have fresh link at the top, but only best links.