Instagram can be a place to share beautiful photos, or it can just be where "beautiful" people come to try and be cool. Someone made a video illustrating the five types of guy on Instagram, and it's pretty spot on.
So according to this instructional film, there are douchebags, hipsters, fitness guys, inspirational guys and the wannabe-gangstas. I think I'd block every single one of these clowns.
This video doesn't point out however that there are plenty of normal people on Instagram. I won't pretend to be one of them, though. I take way too many selfies for that.