14 November 2011 update: Since this article was first published it has become apparent that many Facebook users in recent days have been bombarded with hardcore porn and images of violence and animal abuse. You can read more about that attack here. Please accept our apologies for any inconvenience caused.
The following article was published in September 2011. It is included below for completeness, however we now believe that there *is* evidence that a problem consistent with the warning messages has struck many Facebook users. In light of that, we advise users that it should no longer be considered a hoax, and apologise for any inconvenience or confusion.
Warnings are spreading like wildfire on Facebook, claiming that hackers are posting pornographic movies on users’ walls which are invisible to the owners of the wall but are visible to friends and family.
You can imagine how that would be pretty embarrassing if were true. Fortunately, as far as we can tell so far, it’s nonsense.
Here’s what a typical message looks like, spread by a Facebook user who thinks they are warning their friends – but really perpetuating the scare…
Read more in my article on the Naked Security website.
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