You may or may not be familiar with the "Honesty Box" application on Facebook - like similar features on Myspace etc, it allows people to leave entirely anonymous messages on your Facebook page to the tune of "I love you" or "You're a big stinky head" leading to hours of fun for all the family.
It seems a group of individuals are spamming a fake program to the walls of unsuspecting Facebook users, promising to "reveal all" with regards who called them an idiot at 2 in the morning:
The program claims it will strip out the hidden data from your honesty box, then convert it into a name so you know who left the message. Of course, it's all nonsense; the program is bound with a random Keylogger / Trojan / Virus of the attackers choosing, which means your day could take a very random and unfortunate turn depending on what they have in store for you.
This could be a perfect setup for scammers to phish accounts, then use those compromised accounts to spam the application onto more Facebook walls where new victims can be attacted by the lure of "really secret stuff".