So when did showing the home of more than 70 people engulfed in flames after a FBI assault become beyond the pale? Facebook presumably blocked everyone who sought to share that image from the most vivid law enforcement debacle of the 1990s.

This was not the first time Facebook erased an iconic image that the U.S. government would be happy to see vanish. Facebook likely deleted thousands of postings of the 1972 photo of a young Vietnamese girl running naked after a U.S. plane dropped napalm on her village. After coming under severe criticism last year, Facebook announced that it would no longer suppress that image. Unfortunately, Facebook is unlikely to disclose a list of the images it bans. Because most Americans are clueless about current events and recent history, they will have little idea of what vanishes into the Memory Hole.