According to Piper Jaffray’s latest semiannual survey of American teens, the most important social networks among teenagers are Instagram, Twitter and Snapchat, in that order. One-third indicated that they found photo-sharing app Instagram to be their most important social network, while 20 percent cited Twitter and 19 percent listed Snapchat. Only 15 percent said that Facebook was their most important social app. “The findings support the view that younger users are less engaged with Facebook and prefer alternate sites,” reports The Wall Street Journal. However, “this spring, Pew Research Internet Project found Facebook the site used most frequently by U.S. teens between 13 and 17.”