We received a message from Facebook that our site "login has been making recent API calls to Graph API v2.0, which will reach the end of the 2-year deprecation window on Monday, August 8, 2016. Please migrate all calls to v2.1 or higher in order to avoid potential broken experiences." I know some earlier versions of Xenforo don't support the newer Facebook API versions. I have two questions: #1. What is the oldest version of Xenforo that will support Facebook API v2.1? #2. If we upgrade to the latest Facebook API v2.6, what is the oldest version of Xenforo that will support that? Thank you.