Quantter
Quantter is a web site where you can track your daily activities using Twitter. The Quantter format (or Quantt) looks like this: #activity:numberunit. For example, if you want to post how much you ran, you post to Twitter: #run:5km. You can also post on the web site. You can also share your goals on Twitter, so others could cheer you on. The web site has lists of your Quantts and you can compare yourself with others. When you reach goals on Quantter, you get badgets similar to Foursquare.