The Bay Area Transit Police, amusingly known as BART, show that law enforcement still doesn’t understand the value — and challenges — of social media. The police force reacted to planned flash mobs by shutting down cell phone service in the BART stations. Hey, if you can’t talk to one another, how are you going to organize, right? Thank God BART wasn’t around when the Founding Fathers were trying to hammer out the U.S. Constitution. Perhaps the transit agency would have drummed the unruly bastards out of Philadelphia before they could dream up the First Amendment.