Doing Church on Facebook

That's what a pastor at Liberty University did last night. They usually meet in the on-campus arena, but because of a scheduling conflict, the pastor decided to just use Facebook.

I'd like to find out if it was successful. Of course, that begs the question of what would be considered a success. But assuming it was successful, would it be in the interest of the involved parties to just do church on Facebook everytime? Why even use the arena?