When you see your follower count on Twitter drop, it’s a natural instinct to want to find out who unfollowed you. Unfortunately, Twitter doesn’t provide a built-in way to check for them. You can try to comb through your list of followers manually and see who’s missing, but unless you have a very small list -- or a photographic memory -- this tactic probably won’t be successful. If you’re dying to find out who dropped you, you’ll have to turn to a third-party application.