Many of my friends asked me how can we unfollow those people on our Twitter profile that are not following us back. One of the reasons that people want to do this is to get a decent ratio between followers and unfollowers.
You can unfollow those people who are not following you back on Twitter with a single click. Thanks to justunfollow. Go to www.justunfollow.com. Sign in there with your Twitter account and you will be able to unfollow those people who are not following you back. There is a limit of 100 users to unfollow in a day at justunfollow.