Now Instagram, the photo-sharing app owned by Facebook, is for the first time taking its own stab at Snapchat. On Tuesday, Instagram introduced Instagram Stories, which lets people share photos and videos that have a life span of no more than 24 hours with friends who follow them. The service bears a striking resemblance — some might say it is a carbon copy — to Snapchat Stories, a photo- and video-sharing format where the stories also disappear after no more than 24 hours. The move could ignite a head-to-head battle between Instagram and Snapchat, which have long lurked in each other’s territories but have not faced off directly. Both are mobile apps that use primarily visual media. Both became popular first with young people. And both are now trying to improve their businesses by increasing digital advertising in formats like Stories. Read more at The New York Times.