Do social sites with karma need a decay function?
mechanical_fish: Given that I have fairly high karma, it's hard for me to claim that I'm unbiased...... but this is a bad idea. For one thing, decaying karma is devalued karma. Why should people work so hard to gain something that is crumbling into dust all around us?But the bigger problem is that absolute value of karma is not that important. The important social signal is in the first derivative. If you make a post that people like, your karma goes up. If your flaming instinct gets out of control, your karma stays constant or goes down. If karma is constantly going down anyway it will confuse the issue. Either you're going to have to do some complicated mental arithmetic to figure out whether or not you suck ("let's see, I don't think I've looked at my karma total since Tuesday, so my karma should have fallen by 10 by now, but OMG I think it's fallen by 14, so I must suck!")... or, more likely, everyone on the site will subconsciously interpret the ever-falling number as a sign that they suck 100% of the time, so everyone will feel like crap at all times.