How did I earn 1 point's worth of Karma - what are the criteria?
If someone likes what you've posted recently, chances are that someone gave you a karma point for it.
Note the Hugs and Kisses links to the left, right below the karma score. That's where you applaud or smite, that is, give or take away one point of karma. Hugs is +1, Kisses is -1, and if you think this is confusing, you're not alone.