Having a lot of users following your account in Twitter is a good thing… or isn’t it anymore? As @digitalnaiv, it is worth to focus on a vibrant network or in one that is out of date? If you want to have a healthy community of followers, based more on quality than quantity, you can use tools such as Tweepi to force people to directly unfollow you. This way you can leave out those who do not tweet anymore or have abandoned accounts. This is useful also for doing some clean up on the people or brands you are following.