Twtrfrnd apparently doesn’t like vowels but goes ahead and gives you a comparison about who follows you and if you should possibly follow them back based on who follows them also that you follow. Follow me? If not here is there excerpt:
A new follower? Should you follow back? Find out if you have common followings with them, and which people you follow that follow them.
So the idea is to see commonality in followers. What they have coming makes the most sense since it will help automate follower management and groupings:
Coming soon: Log in and automatically get the common friends and indicators for all your newest followers, and sort your friends into groups
I ran this and found the results mixed with no tool to act on what I got back. I think this will come along nicely, just give them a moment.