Each new season brings a new "Teens On Facebook" survey. But the latest Piper Jaffrey study of 7200 teens age 12-19 confirms a trend we've seen brewing since last year - teens are leaving Facebook. As of last month, less than half answered yes when asked if they use the social giant. Between the spring of this year and now, teen Facebook use fell from 72% to 45%, according to Piper Jaffrey.
This graphic shows the dramatic drop and hints at how teen social time is shifting: