The Hartford Courant is reporting that authorities told them that the 4chan post was made on December 12th, 2 days before the shooting, but it wasn't Adam Lanza that posted it. This damning indication of outside involvement in the Sandy Hook school massacre, is what the authorities consider a "hoax" apparently.
Sandy Hook Shooter Lanza Left Little For Investigators To Trace
GRAPHIC: Did Elementary School Shooter Adam Lanza post his plans on the website 4chan? (UPDATED)