Manually sifting through your followers to identify these users could take hours. That's why several sites have sprung up to help you take back control of your Twitter account. These sites scan your followers and generate a list identifying which ones haven't tweeted in a while so that you to remove them accordingly. Check out the top five picks for free sites that help you efficiently restore order to your account.
Tweepi's 'Cleanup' tool gives you five options for organizing the people you follow on Twitter. You can sort according to which of your followers are most active, which are most influential, how frequently they retweet others, how often they engage in discussions (measured by their number of @replies), and their follower-to-following ratio. Tweepi also lets users weed out "linkless ramblings." In this manner, you can select which users you want to follow back or unfollow entirely.