I am using paid facebook plugin, it works as expected.
After facebook app redirects back to appgyver app, there is a "Back to Facebook" link in the topmost menu that never goes away. Is there a way to get rid of it?
This is iOS-level stuff, I highly doubt that any app would be able to change this, let alone a webview-based one. However, this SO question has a possible workaround – disabling the status bar. Is that something you are willing to do?