karma calculations decide how much to increase based on plurking too much, too little, just right, and how popular your plurks are

as long as it is going up, then you are on the right track.

also, at 61 points you "leveled up", from now on until 81 you will be able to gain 0.09 per update, after 81 you can only get 0.04

woo, thanks Julkian