Over at Foreign Policy's Passport, Uri Friedman counts the ways that Twitter looks more like a tool of the present than a harbinger of better tomorrows.

He writes that people who "threaten violence" on Twitter have been arrested:

Earlier this week, DHS agents detained Irish traveler Leigh Van Bryan and a friend at Los Angeles International Airport and sent them back to Europe after Bryan tweeted that he was going to "destroy America" and dig up Marilyn Monroe during his trip — references, he later told officials, to partying and the comedy show Family Guy, respectively (the incident conjured up memories of other jokes gone awry, such as when the Onion enraged the U.S. Capitol Police by tweeting, "BREAKING: Witnesses reporting screams and gunfire heard inside Capitol building"). In 2009, FBI agents arrested an Oklahoma City man named Daniel Knight Hayden for threatening on Twitter to kill police officers during a Tea Party tax protest. Hayden was sentenced to eight months in prison.

(to read the rest of the article, click HERE)