4c is considered the cnapp as termed by cnappyme for the cloud or cotton texture with no defined curl pattern. cnappyme has developed her own site devoted to the cnapp. I first met her on nappturality. I'm a mix of 4a/b/c with VERY LITTLE 3c.
The board first started out on wordpress at http://nappyme.wordpress.com
but moved to http://s3.excoboard.com/exco/index.php.