The Internet revolution and the proliferation of blogs has had the US military in a state of worry. Recent Army regulations advised soldiers they were required to have any blog postings or other public communications cleared by superiors before posting. The overt explanation for the change was for operational security reasons--a valid and important concern for military leaders.
Military leaders have been so insistent on the need to crack down on soldiers' ability to freely communicate in public venues, they're likely going to be embarrassed by the public revelation that Army audits have shown official DOD websites have committed far more violations of operational security than military blogs.
According to Noah Shachtman in Wired's Danger Room, the Army Web Risk Assessment Cell (AWRAC) performed the audits between January 2006 and January 2007. The investigation uncovered at least 1,813 OPSEC violations on 878 official military websites, and 28 breaches, at most, on 594 personal blogs.
Schachtman reports that on one personal blog, AWRAC found photos showing bomb damage to a Humvee; on another, a description of a mountain near a base in Afghanistan; on a third, a video about "morale concerning incoming mortar." AWRAC discovered a secret presentation on the official, unclassified Army Knowledge Online network. It found a map of an Army training center in Texas on a second .mil site. A "colonel's wife's maiden name" was caught on a third.