Spymaster is a twitter game of sorts and largely dependent on your # of followers. You can complete tasks, assassinate other users, buy weapons and other such fun.
You get a bonus for allowing Spymaster to send notifications of your progress via your twitter account. While the urge to turn every one on is great its not kind to your non-spymaster followers. On the other hand, twitter asks "what are you doing?" and the notifications are specific to that question. Depends on your followers.
Follow me at @jyuichi if you do join :)