1. FBI officially blames North Korea for Sony cyberattacksThe Federal Bureau of Investigation formally blamed North Korea for the cyberattacks against Sony Pictures in a statement on Friday. North Korea had denied involvement in the attacks, which were carried out by a group calling itself "Guardians of the Peace." The group made threats against movie theaters that planned to show The Interview, a movie starring Seth Rogen and James Franco, in which the actors attempt to assassinate North Korean leader Kim Jong Un.