A ghost follower is an Instagram account that follows you but never actively engages with you (i.e. never likes or comments on any of your Instagram content).
For serious marketers, social media and content marketing professionals, high follower numbers alone are not enough. Other metrics take center stage – such as engagement or engagement rate. In these cases, ghost followers are a major obstacle to success.
Ghost followers correspond to the following characteristics:
No profile picture
High ratio of people they follow-for-follow
0 posts in the last 30 days
Username is filled with random numbers
There is only one legal way to remove low-quality followers.
Manualy Block Them
If you have an Instagram Business Account, the only way is to block ghost followers manually. To do that, find their profile by tapping the (…) in the top-right corner and hit ‘Block’.
It's easier to complete this procedure by switching from a Business Account to a Personal one and set it to a Private mode. You are capable to of removing ghost followers instead of blocking them.
It takes a while to complete this kind of procedure, though in a week or two you will have a completely refreshed and clean account, which elevates its value and makes it appealing to advertisers.
According to the recent statement of the Unilever's CEO - Keith Weed, most of the big
brands decided to step back from working with bloggers who have the inauthentic audience.
Don't be scared to get rid of the inauthentic audience. You have more value as a blogger with 20K real followers and a good reputation, rather than having an account with some artificially boosted numbers.