Youth Ministry Media is a resource I have referenced before. They seek to help youth workers communicate with teens. They provide interesting information the use of social media in our culture and some free resources for youth workers.
Over the weekend they referenced two different pieces of information from Pew Internet and American Life Project. One had to do with the average number of friends teens have on Facebook and another that talks about what they share. Interesting that girls on average have more FB friends and that sometimes teens post false information to protect their privacy.