If Using Domain Mapping MU plugin, Network wide Facebook settings work

In the past, Domain Mapping plugin would not allow network wide comments and facebook settings for sites (as facebook apps require a domain for Login authentication, postings, etc)

However, using Ron's Domain Mapping Must Use (or whatever) plugin, I can have network wide Facebook API/Keys and allow domain mapped sites to post to their wall and login/connect using a generic app.

(Also Ajax of the Visual editor works using theirs)

Just thought I would point that out to you should you wish to see how theyre doing things differently, as this one appears to work better (although its no longer integrated with Pro Sites)