Benghazi and the use of social media

from news.yahoo, White House told of militant claim two hours after Libya attack: emails:

The first email, timed at 4:05 p.m. Washington time - or 10:05 p.m. Benghazi time, 20-30 minutes after the attack on the U.S. diplomatic mission allegedly began - carried the subject line "U.S. Diplomatic Mission in Benghazi Under Attack" and the notation "SBU", meaning "Sensitive But Unclassified."

The text said the State Department's regional security office had reported that the diplomatic mission in Benghazi was "under attack. Embassy in Tripoli reports approximately 20 armed people fired shots; explosions have been heard as well."
The message continued: "Ambassador Stevens, who is currently in Benghazi, and four ... personnel are in the compound safe haven. The 17th of February militia is providing security support."

A second email, headed "Update 1: U.S. Diplomatic Mission in Benghazi" and timed 4:54 p.m. Washington time, said that the Embassy in Tripoli had reported that "the firing at the U.S. Diplomatic Mission in Benghazi had stopped and the compound had been cleared." It said a "response team" was at the site attempting to locate missing personnel.

A third email, also marked SBU and sent at 6:07 p.m. Washington time, carried the subject line: "Update 2: Ansar al-Sharia Claims Responsibility for Benghazi Attack."
The message reported: "Embassy Tripoli reports the group claimed responsibility on Facebook and Twitter and has called for an attack on Embassy Tripoli."