In an effort to thwart off time-theft and loiterers, Apple has decided to add Facebook to the list of banned websites at retail locations nationwide. When I asked some of the genius today whether or not anyone noticed the change, they all said that Facebook stopped working sometime in the past week.
The reason for the banning, of course, is to prevent loitering at Apple stores. MySpace was similarly banned in 2007 according to the site.
Update: According to the Wall Street Journal, Apple has denied having an official policy of blocking Facebook from computers in their retail stores, although it appears that some individual stores may have blocked Facebook of their accord.