Why do I get fake followers on instagram?

[Mia]

Okay so the past 3 weeks or so, I have had TONS of fake instagram accounts following me. I know they're fake because they have only like one picture and it's a spam thing and all of their Bios basically say the same thing,

Anyway, I get at least 50 of them a day, and it's really annoying. They don't say anything or comment it's just annoying. Why do they follow me and how can I get them to stop?

[Fiona]

I've been getting them as well and it's very annoying. The accounts are bots that automatically follow anyone, however i think it has a lot to do with whether or not you are hash tagging your photos. I've found that they only seem to follow me when i add various hash tags to photos i've posted, so maybe try not to do that if you are doing so or by making your account private? In order to have them unfollow you, just go onto your list of followers and onto the profile of the spammers and click 'report for spam' then they should automatically unfollow you. I had to report about 60 profiles for spam until i got back down to my number of genuine followers.