HI,
I don't have a Facebook Account which makes it difficult to find out anything from their site.
Even to find the the "instructions" to use Facebook Chat IDs in iChat you have to be logged in !!!
Searching for "Facebook Chat Server Status" got me the following:-
http://developers.facebook.com/docs/chat/
Leads to Facebook's Hlep Center at this page
Nothing about the Status of their server at all.
There also seems to be an item at Facebook called Server Status that seems to look at Users Servers.
The messages listed on the page for it are out of date - some do seem to refer to the Chat server though.
There seems to be a video (which for me is too small to read anything useful) here at YouTube
The piece is not that long but the blurb underneath may have had a link.
9:32 pm Thursday; July 25, 2013
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.4)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously