How to set up Facebook Login in iOS app?
This guide will show how to configure iOS application for Facebook Login..
1.) go to https://developers.facebook.com/apps/
2.) Select You Project (or create new) and Click (left sidebar): Settings->Basic
3.) Click -> Add Platform

4.) Click -> iOS

5.) Enter you iOS app Bundle ID

6.) Click -> "Save Changes"

7.) In XCode select "info.plist" and edit you "FacebookAppId" and "FacebookDisplayName"

8.) Also in file "info.plist" edit you "CFBundleURLSchemes", in section "CFBundleURLTypes" or "URLTypes"