Dit not see this posted yet:
http://edition.cnn.com/2015/12/04/us/san-bernardino-shooting/index.html
As the San Bernardino attack was happening, investigators believe the female shooter, Tashfeen Malik, posted on Facebook, pledging allegiance to ISIS leader Abu Bakr al-Baghdadi, three U.S. officials familiar with the investigation told CNN.
The posting was by Malik made on an account with a different name, according to one U.S. official. The officials did not explain how they knew Malik made the post.
http://edition.cnn.com/2015/12/04/us/san-bernardino-shooting/index.html