Twitter is a great way to reach out to others, but there are an insane number of bots and fake accounts out there. If you want to remove all of your "egg" followers, this simple Google Script helps you weed them out.
As explained by the script's creator, Amit Agarwal at Digital Inspiration, explains, they're called "egg" followers because the default Twitter account image is an egg with a coloured background. In fact, that's how the script searches for them. It looks at the URL of each of your followers Twitter avatar and pulls any with the word "default" in there. Of course, not every egg account is a bot or fake. Some folks just like to remain anonymous. In that case, you can see their recent activity and whether they have ever tweeted at all. It takes a little time for the script to run, so be patient. The more followers you have, the longer it can take. Get a copy of the script and learn more at the link below.
Find How Many "Eggs" Follow You on Twitter [Digital Inspiration]