No, I post and look at almost exclusively photos of the outdoors in the western USA. I have no recommendations for butts, and few for photos of people of any kind -- they accurately point me to other nature and landscape photographers, and not much else.
I never see butts on instagram :/, but I just use it to occasionally share photos I'm proud of, and that's usually the only time I also happen to browse what my friends have posted. I have zero interest in any social/communication aspect that instagram may offer.
