Twitter bot that sorts followers

Most of us know about flashtweet.com and how you can follow a massive amount of people every day until you reach 2000. In which case you will need to go and unfollow everyone who hasnt followed you. And tbh i cant be bothered going through my 1k followers and my 2k i follow to sort out which ones havent followed back. Im sure a program like this would be simple to make. Is there anything like this available?