If you haven't checked out the latest study from Edison Research/Arbitron Internet and Multimedia Research you can download here:
Twitter Usage In America: 2010
Hope you get plenty of use out of this report!
As you know Social Media has the power to take your communication one step further – to the listener’s turf. With this power...comes great responsibility...just kidding but seriously you now have the power to FIND them where THEY are....and bring them BACK to YOU!