One of my friends had his blog shut down becuase of this rule. He is serving overseas as a Reconnaissance Marine and has had his blog/website up for years without incident.
Its funny how the govt will trust him (as they trust all Recon Marines) enough to drop a $40k+ JDAM on living bodies or other strategical targets he relays into his Command but not enough to blog.
Ironically most cases it isn't the little guys like him that have issues leaking information, its big wig politicians (as seen in recent years) that discuss confidential information to people without the "need to know".
Either way, these politicians and that Marine that gave the blueprints to the KGB agent (years back) are the people we have to pay the price for
Also, to think the DoD doesn't monitor their inbound/oubound traffic in any form is silly (regardless what they say publically). They watch over traffic like a Hawk, especially since belonging to the DoD you actually have less rights than you do as a civilian.
I tolerated this for 4 years which gave me new respect for the rights I do have as a US Citizen but were denied as a US Marine.
Bless those that serve, for they are truly making a sacrafice.