I am seeing a surge in teenagers, as they get older toward mid-late college, using two Facebook pages. One is their "professional" page - for family or job prospects. Yes, family is included, they often consider a family broadcast a hindrance to their privacy! The other is their regular page complete with beer pong and weekend parties.
Though beer pong rarely makes it into my broadcasts, I have no less than four social networks (education PLN, classroom use, music and arts, and personal).
What about you all? How many Twitter feeds are you handling?