According to this question, the official Facebook page for Stack Overflow is this one, with 2,400+ fans.
So what's this Facebook page?
I do find the "Related Global Posts" on the imposter page absolutely hysterical though...

(source: gitlin.name)
Related Global Posts
Donna Evans
I Keep Getting This Darn Message Popping Saying----Message From Web Page Stack Overflow @ Line 28 What The Hell Is This Anyone Know Help Me Thanks a few seconds agoDiane Bookwalter
HELP I keep getting a pop up that say "Stack overflow at line28" and then I can't do anything. I can't click off and I have to just restart the computer from here ?? Any idea what's going on ?? Thanks 6 minutes ago · View Feedback (6)Mitzi Cotton
OMG THIS FRIKKIN OUT OF MEMORY AND STACK OVERFLOW ERRORS ARE MAKING ME CRA....................................ZY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 9 minutes ago · Comment · Like · View Feedback (4)Karen Conner
JUST WONDERING WHEN MY "OUT OF MEMORY" AND "STACK OVERFLOW" ERRORS WILL BEGIN TO POP UP AGAIN :-( 10 minutes ago · View Feedback (3)Ann Wilson Belford
what is stack overflow? and what dose it mean 16 minutes ago
EDIT: It's all OK now, I altered the duplicate page so it looks correct now:

(source: gitlin.name)