As stoopid as the policy seems, it's a real issue for worker bees employed by certain federal agencies or their contractors. For instance, on June 6, ArsTechnica ran its first story on PRISM [NSFDoDW], featuring a thumbnail of one of the slides...a slide clearly sporting the legend "Top Secret/SI/ORCON/NOFORN." The next day, DoD issued a memo on viewing classified material on unclassified computers. Instant shit-storm-in-a-cup, as Ars readers began to chime in with pleas to stop posting such images to the front page, and to place some kind of spoiler alert on the article links.
It was kinda painful to watch the snark and sarcasm aimed at these readers' concerns, even by staff. After two weeks the decision was made to not place such images on the front page; no other accommodation was made. (Which seems odd...the rule for folks with InfoSec looking over their shoulders is caveat lector, while those in conventional cubical farms continue to get [NSFW] warnings on articles that link to shocking naughty bits.)