Its a turn based strategy game, so games can go on for weeks but you can spend five minutes making your moves and then get back to work while others take their turn.
In my first attempt at writing facebook applications, I've melded together the facebook and weewar APIs to create a widget which displays your weewar stats and current games on your profile. Links to weewar.com on the widget are also accredited to you as the referrer, which means you gain the points needed to become a Weewar Pro!
Weewar is currently invite only. If anyone wants an invite, leave a comment.