Why do most instagrammers use iPhone?

Most of the instagrammers who have thousands of followers and take good photos use iPhone instead of Android? Is that because iPhone is not too big on hand and has better camera than other phones?
Why not Galaxy S4 or Luma?

I don't know if it's just me or everyone, but I feel like Instagram ruins the quality of pictures taken from android phones. I've notice that since I switched over to iPhone, the quality has been so much better. I'm not so sure about the s4 and the more recent phones with better quality.

No, tests have actually proven the s4 and Lumia cameras to be better. Especially the Lumia in the dark.

Most instagrammers have iPhones because they're more desirable and fashionable. Regardless of the fact that android phones are better in terms of the things you can do on them, software wise.

It may be something about compression. Best quality is DSLRs. Easy to get on instagram. Using RAW files edit it in your photo editing software then upload to flickr then save the image from flickr onto your phone regardless whether it is android or iPhone