Not sure if this actually applies to the iOS app, as I'm an Android user, but I figure both platforms share the same features.
When browsing my favorite SE sites from the Chrome app, I can copy a link's address by tapping & holding - there's some sort of context menu just for that.
It would be nice to enable something like that in the app, so comments, questions, answers and other hyperlinks could be copied and then pasted onto a new comment, question or answer... or into the ChatSEy app, or anywhere I want.
Instead of using the SE app, I often use Chrome to do that. The app already supports tap & hold paste from clipboard, why couldn't links be copied from the SE app?
(yes, this is a phone post from the Android app)
Update: please read this as a feature request to add some "copy url" functionality for anything that doesn't already have it through the "share" button (comments, user profiles, ...anything else?)