It seems that Games Workshop has now closed down its Facebook page and is opting to only keep up its individual retail store pages. This could very well be a response to all the negative posts on their facebook page recently, after all, I probably would of taken it down if it was mine.
Regardless of the reasons, here is GW's response to emails regarding the take down of the GW Facebook page.
A big thanks to Harely for forwarding GW's response to the Faeit 212 inbox
Many thanks for your email. The Games Workshop Facebook page has been removed so that the customer interaction goes through our retail stores. This will be via face to face contact with customers while they are visiting the stores, or by using the individual Facebook pages each store has.
The individual stores Facebook pages can be found here;
http://www.games-workshop.com/gws/content/article.jsp?aId=17500005a
We hope this has been of help.
Kind regards, Scott Edwards