Tool to search unfollowers in most popular photo and video sharing social network.
If you don't like users who follows you and you follow them back but then they unfollow you.

App include those lists:
-Unfollowers (don't folow you back)
-Recent unfollowers
-Mutual followers
-Follow back followers

Official web api used.
You should not to make too many requests in short time due to limits. Sorry about that.