What it does is record the activity of your twitter account. It displays follower, follow, block, and list history since you've authorized this app to your account. It has small, simple statistical data page showing how much you gained/lost something such as your tweet, RTs, and so on. i've been using this for three years tho, it's nice to see who's new and who's away from you. There're not many apps allows you to do this kind of thing with this simplicity. Try it out.
See who follows and unfollows you on Twitter, and much more!
If you're serious about Twitter you need Birdbrain! Birdbrain checks your Twitter accounts for changes to your friends and followers, mentions, retweets and list memberships.
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When you start Birdbrain it takes a snapshot of your Twitter account and shows you the changes since it last updated. While Birdbrain is running it will automatically update every 20 minutes.
Users are shown with a plus symbol if they are new, or a minus symbol if they were removed. Some users are displayed as a number rather than a username: these are users that were removed before Birdbrain loaded their details, or users that have been suspended by Twitter.
Tap a user to get more information, or to follow, unfollow, block or report spam.
Switch to the Summary tab to see your statistics.
Follow @birdbrainapp on Twitter to ask questions or to send feedback.