The floof-o-meter is basically a karma system we have here. If a user notices that you did something great (help out someone, write a really cool story, or just being a nice person, etc), then they will nuzzle you if they so choose (however, don't feel bad if you don't have any at the moment, it's not a measure of how much you're doing, just a thank you c:). It's all anonymous, so it's really interesting to wonder about who gave you the floof and why ^^
Anyways, since you seem pretty happy with the answers above I'll go ahead and lock this up now c: