I've always wanted this experience on GitHub regarding followers. It took me a couple of months procrastinating, and now it is here.
Right now, when you sign up, bi-hourly snapshots of your GitHub profile is taken to spot changes to your profile every day, if there are any, and in case you miss any change, you'll get a weekly summary of who followed or unfollowed you.
What's more fun about this is that the Ghosted is open-source, so if you find any bug or have an improvement, feel free to open issues.
twiBook