BadFriend

Monitor Twitter users who stop following and 'unfollow' back.

-No auth required - unlike other Twitter unfollow apps - just your screen name.
-Unfollow selected unfollowers by clicking a link in the results screen.
To use:
On first login, you will be prompted to enter your screen name.
Run 'Refresh Followers'. This will build your initial follower DB.
Wait a day (or so), then run 'Check Unfollowers'. This will present a list of those who stopped following you since your last 'Refresh Followers'.
-Click the hyperlink in the results UI to be taken to Twitter to unfollow (if desired).
-Press the 'Removed from DB' button to remove the same from your local DB If desired.
-Run 'Refresh Followers' periodically to add new followers to your DB and sync.

Requirements:
-Minimum API Level: Android 4.0.3 (ICE_CREAM_SANDWICH - 15).
-Not meant for large numbers of followers. Program limit is 5K. Testing with approx. 750 followers on a Samsung Galaxy II runs well. 3.5k users takes a couple of minutes to refresh. Unfollower check is relatively quick.
-Observe Twitter's best practices for following: https://support.twitter.com/articles/68916-following-rules-and-best-practices.

FAQ:
-Why can't the app just unfollow directly? A: Twitter limits unfollows to one at a time to prevent abuse so you would be clicking away anyway. Also, this would require you to authenticate. This solution keeps things very simple and limits authenticating (one of the reasons I wrote the app). It's really not difficult to unfollow using the link to Twitter and you can rest assured no one is hijacking your credentials.
-How does it work? A: Twitter 1.1 Rest API and OAuth app level authentication. Results are stored in a local, small footprint SQLite DB.