A Brookings Institution study has found that ISIS supporters are adept at getting the group's message social media traction.
The attacker Kim Ki-jong had made seven visits, organized by the unification ministry, to the North between 1999 and 2007.
By Thursday night, the documentary's original link posted by the BBC had been viewed over 100,000 times.
ISIS militants had demolished ancient statues at the Mosul Museum last week.
A letter, signed by eight Republicans and three Democrats, calls on Obama to arm Ukraine in its fight against pro-Russian rebels.
The Chicago mayoral challenger slammed Rahm Emanuel for his ties to the controversial program.
Three members of al Qaeda affiliate Jabhat al-Nusra also were reportedly killed in Syria on Thursday.