Instagram account holders have been hit with a wave of spam lately, and from a different source than many have previously experienced. I'm talking about the auto-like or auto-follow phenomenon, where Instagrammers suddenly notice they're following unfamiliar accounts. How does this happen? Insta-following seems to happen when Instagram apps are granted more access to our accounts than they should have. Let's learn how to revoke permissions from spammy apps so we can reclaim our iPhone's Instagram feeds.