How do you use 2p2?

[Paul McSwizzle]

Every now and then someone posts a graph in BBV of them winning like 40k or 200k or w/e, and says "Thanks 2+2"

So obviously two plus two is a great resource, I know that. My question is for those players: how exactly do you make use of two plus two? Is it all about posting hands that you have trouble with, or is it about getting involved in discussions on hands that others post?