Every now and then I think about playing #nationstates again, which is a the silly browser based game where you run a country and every decision you make turns extreme and things go comically wrong.
The best part of it is really the roleplaying - because there's not a way for countries to fight with each other, people playing the game just decided to do forum based RPs where they play as characters from their countries, fight wars, and write elaborate guides to their imaginary countries.