TRIPOLI - On a late July day in downtown Tripoli, a young man steps into a car idling next to the Libyan capital's iconic Martyrs' Square. From the back seat, he hands to the driver what Libyans refer to as a "Turkish pistol" and some bullets. In return, the driver hands him a thick stack of 10-dinar notes. The exchange had been arranged using one of the numerous Facebook "groups" created in recent months to link gun-sellers to gun-buyers through the social... (GunPolicy.org)