Ista-labs are a follower provider for Instagram. They are an online based service that sell followers and likes to their customers for a fee. Unlike other providers, they keep their cards very close to their chests when it comes to the pricing of their services, you aren’t able to attain this without first sending them an email.
SocialFollow is a service where they state they will give their customers free Instagram followers. Seems easy right? All SocialFollow ask you to do is download their app, follow 10 accounts that they specify and then in return they will give you 50 followers a day.