So...what's this 'Karma' shit all about?
Simple, my friend No shit about it!
If you like what somebody's sayin', or think they deserve a little pat on the back for whatever reason; slip a little Positive Karma their way!
If, however, you think the offender is a Total Jackwagon, let him and the Rest Of The Civilized World know by slipping a little Negative Karma his way. Some folks wouldn't know a snake if it bit 'im on the ass. But they recognize negative Karma when it knocks on the door!
BTW....negative karma 'subtracts' from a positive rating, and vice-versa.
Now that you know what it is, go forth and brandish your weapon!