Refollow will allow you to analyze the followers and the people you follow and you can decide whether to continue to follow them or to stop.
1. You can find how many people you following are not following you back.
2. How many people you following are not tweeted in a given period of time
Following Me Not Following Me I'm Following I'm not Following Previously Followed Never Followed Locked Not Locked With picture Without picture Tweeted in the last -- days No Tweets in the last – days Search for Exclude terms This is a really cool website to manage and analyze your twitter connections.
from their website
Manage your Friends and Followers
Group by Relationships
Sort by Importance
Explore Twitter Social Graph
Discover Relevant Users
Filter Irrelevant Users
Batch Follow/Unfollow/Block
Crowd Tagging and Comments
Lock Relationships
[Via twitip]