While many teens post their first name and photos on their profiles, they rarely post information on public profiles they believe would help strangers actually locate them such as their full name, home phone number or cell phone number.
At the same time, nearly two-thirds of teens with profiles (63%) believe that a motivated person could eventually identify them from the information they publicly provide on their profiles. —Lenhart and Madden —Teens, Privacy and Online Social Networks (Pew Internet & American Life Project)