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Twitter Lists are like groups that you can follow or create for yourself.
Sometimes you may think that you might have made an error in following a list or you just don't want to follow it anymore. It is very simple to undo this by going to the list that you are following and scrolling down until you see a link under Actions called "Block Listname". Click on it and you are not following this list anymore.
Try to start one list today and add anything that interests you to your new list. I am sure that you will benefit from using Twitter Lists!