It cross references your reputation points on 'nova with amount of posts in Drew's poo log and then applies a "quality of posts while drunk" coefficient to that result.
It's quite remarkable in this respect.
But, um, yes the pride you may have fleetingly had in your Angry Birds tallies will pale when compared to the others.
tl/dr; Results and achievements are shared across GC type apps.
All I want is a simple life