To find out how many lists you are listed on log in to Twitter and go to your profile.
You can get Twitter lists by going to https://twitter.com/YOURUSERNAMEGOESHERE/membership
Once you are looking at your profile page click “Lists” on the menu under your cover image.
Then click “Member Of” on the right, above the lists you have created.
That’s all there is to it. How many are you on?