Considering people share photos to social networks all the time via their iPhones, I really fail to see how this is the case.
So can iOS users, they just have to go into the separate app to do so..and they tend to do just that.
Wasn't your original point that people use instagram to share photos and not for the filters? Turns out that they can do so without it then. What's the point of having a middleman application to take pictures?
My original statements were, that:
1. Filters can be applied with the stock gallery app
2. I don't see the appeal of sharing to a restricted network
To which you replied that people use it mainly for sharing and not for the filters, and then proving it's simple to actually share to other networks without said application.
Again, I don't see the appeal.