In the definition phase we started discussing if questions on facebook games should be allowed.
I'd like to start that discussion again, my vote would be no
I'll reiterate what I said during the definition phase:
At first, I thought we absolutely should take a hard-line stance against them, just as SuperUser does against web apps.
After consideration, however, I've completely reversed my line of thought.
I think, mostly on account of #2, that they should be considered valid. How are we to know -- and should care -- that a *ville player is using a web browser or a client app?
(And for the record, I hate *ville games, and Zynga in general. But that doesn't make them invalid for the site.)