The new Facebook SO site is a great idea, but the experience on there can be confusing, since there's no UI hints for logged in users to inidicate that we're in the Facebook Stack Overflow sub-site besides the URL (which, in future versions of browsers, might disappear).
Can there be some thematic indication that we're on a special "sub community"/sub portal part of site?
For example, I was very confused when I got to this tag page and only saw 14 questions tagged:
Nothing on there tells me that I'm getting the facebook filtering treatment.