Tweet from Harakat Al-Shabaab Al Mujahideen, Somalia's Islamist insurgent movement.

How dangerous can 140 characters be?

Apparently if those 140 characters are being fired onto the web through the Twitter account of al Shabib, Somalia’s militant jihadist movement, then the national security of the United States could be in jeopardy.

The New York Times reports:

American officials say they may have the legal authority to demand that Twitter close the Shabab’s account, @HSMPress, which had more than 4,600 followers as of Monday night.

The most immediate effect of the Obama administration’s threat appears to have been that @HSMPress (which has so far only made 114 tweets) has subsequently gained hundreds of new followers.

Is Twitter itself about to take a stand in defense of freedom of speech?

A company spokesman, Matt Graves, said [to a Times reporter] on Monday, “I appreciate your offer for Twitter to provide perspective for the story, but we are declining comment on this one.”

Last Wednesday, the New York Times reported from Nairobi in Kenya:

Somalia’s powerful Islamist insurgents, the Shabab, best known for chopping off hands and starving their own people, just opened a Twitter account, and in the past week they have been writing up a storm, bragging about recent attacks and taunting their enemies.

“Your inexperienced boys flee from confrontation & flinch in the face of death,” the Shabab wrote in a post to the Kenyan Army.

It is an odd, almost downright hypocritical move from brutal militants in one of world’s most broken-down countries, where millions of people do not have enough food to eat, let alone a laptop. The Shabab have vehemently rejected Western practices — banning Western music, movies, haircuts and bras, and even blocking Western aid for famine victims, all in the name of their brand of puritanical Islam — only to embrace Twitter, one of the icons of a modern, networked society.

On top of that, the Shabab clearly have their hands full right now, facing thousands of African Union peacekeepers, the Kenyan military, the Ethiopian military and the occasional American drone strike all at the same time.

But terrorism experts say that Twitter terrorism is part of an emerging trend and that several other Qaeda franchises — a few years ago the Shabab pledged allegiance to Al Qaeda — are increasingly using social media like Facebook, MySpace, YouTube and Twitter. The Qaeda branch in Yemen has proved especially adept at disseminating teachings and commentary through several different social media networks.

“Social media has helped terrorist groups recruit individuals, fund-raise and distribute propaganda more efficiently than they have in the past,” said Seth G. Jones, a political scientist at the RAND Corporation.

The Times reporter, Jeffrey Gettleman, sounds quite indignant that al Shabib should have the audacity to be using Twitter, so he can hardly have been surprised that his article prompted this exchange between @HSMPress and one of their followers:

Somalia is not the only front in the new war on Twitter.

The Washington Post reports on Twitter battles in Afghanistan:

U.S. military officials assigned to the International Security Assistance Force, or ISAF, as the coalition is known, took the first shot in what has become a near-daily battle waged with broadsides that must be kept to 140 characters.

“How much longer will terrorists put innocent Afghans in harm’s way,” @isafmedia demanded of the Taliban spokesman on the second day of the embassy attack, in which militants lobbed rockets and sprayed gunfire from a building under construction.

“I dnt knw. U hve bn pttng thm n ‘harm’s way’ fr da pst 10 yrs. Razd whole vilgs n mrkts. n stil hv da nrve to tlk bout ‘harm’s way,’ ” responded Abdulqahar Balkhi, one of the Taliban’s Twitter warriors, who uses the handle ­@ABalkhi….

U.S. military officials say the dramatic assault on the diplomatic compound convinced them that they needed to seize the propaganda initiative — and that in Twitter, they had a tool at hand that could shape the narrative much more quickly than news releases or responses to individual queries.

“That was the day ISAF turned the page from being passive,” said Navy Lt. Cmdr. Brian Badura, a military spokesman, explaining how @isafmedia evolved after the attack. “It used to be a tool to regurgitate the company line. We’ve turned it into what it can be.”

So how’s @isafmedia exploiting the power of Twitter? With tweets like this?

A we’re-winning-the-war tweet like this might sound good inside ISAF’s Twitter Command Center, but I don’t think it’s going to impress anyone else.

The problem the Obama administration is up against is not the threat posed by its adversaries on Twitter; it is that its own ventures into social media are predictably inept. Official tweets lack wit and tend to sound like the clumsy propaganda. But when losing an argument, the solution is not to look for ways to gag your opponent — that’s how dictators operate.

The Pentagon prides itself on its smart bombs. Can’t it come up with a few smart tweets?