Twitter is experimenting with a new feature called
This feature will give you statistics on tweets, retweets etc.
Techcrunch was the first to break this story and when they ask twitter about this experiment they were just referred to their blog site.
So now you can get achievements when you tweet. I am trying not to laugh at this but it sounds like a game of sorts. Games have achievements you can earn while playing. I guess some folks will like to see these stats.