http://tweepsect.com/ http://tweepsect.com/ might be what you need. I built it a few years ago, it tells you who is following you back, and if they haven't twee

http://tweepsect.com/ http://tweepsect.com/ might be what you need. I built it a few years ago, it tells you who is following you back, and if they haven't tweeted recently, etc. Unfortunately it doesn't scale well to really huge accounts (+5k nodes).