Remove Your Deadbeat Friends:
Twitoria helps you find people on your follow list that haven’t tweeted in a set period of time (when it works). This is great for users who follow lots of people, as there is a natural rate of turn over with Twitter accounts.
By default, the list contains all your friends and followers and is sorted by last update, showing those who most recently updated first. You can sort the list alphabetically either ascending or descending by Twitter ID. You can filter the list in several ways: only friends or only followers, all friends or all followers, and mutual friends.
My Cleenr is a brutally simple list trimming utility for Twitter that shows you a list of people you’re following, with the oldest tweeters on top. This allows you to remove accounts that may be dormant or abandoned.
Tweet buddy is another great utility that allows you to break down your list of follows based on who follows you, and who is not.
Friend or Follow
Friend or Follow is by far the best looking of these utilities, which means absolutely nothing, but they get brownie points from me for matching that ‘Twitter’ look very well. The list of your friends who are not following you uses your Twitter theme which is a nice touch.
Twitterless is the most comprehensive of all these tools, and works in a very different way. To signup you need to follow them (how clever) and the purpose is to allow you to group your friends, filter & search them, locate your followers, and see graphs on your Twitter usage.