One of the reasons FourSquare is popular is because you can get awards or badges for your check-ins. Would it be of interest to anybody if you could get badges for your tweets? Some ideas for badges:

• The stalker badge - following more than X users
• The noise badge - Tweeting more than X times in the past hour
• The chatty badge - replying to X users in the past hour
• The profanity badge - swearing more than X times in your past X tweets
• The Romani badge - tweeting from more than x locations
• The greedy guts badge - tweeting more than x times about food