This website has been a great way of telling who is unfollowing me on twitter. Rather than making a list and checking it twice to see who has unfollowed me, this service keeps track of your new followers, and people that have been unfollowing you. It is amazing how well this works. Whenever I lose a follower I shoot them a tweet asking them what I was doing wrong for them. Usually, you can gain that follower back. This is an amazing service, and I will use it until the end of my twitter days.