I and the rest of the PIXELearning team that have Twitter accounts have been engaged in a bitter war for a few weeks now on Spymaster.
See http://playspymaster.com
The game involves acquiring assets & cash and basically killing other users. It is buggy, has annoying traits, little instructions and yet we cannot stop using it.
It has also, I wager, seriously subverted the Twitter platform. Two weeks ago I had about 66 Twitter followers. After signing up for Spymaster, just 2 weeks later I had 188. None (I guess) of these new followers know me or care about my Twitter posts. I wonder what the guys at Twitter make of this? Great boost for their platform or worrying abuse of it?