If you could only pick one which would you pick? This would be very hard but I think I would pick Twitter but I am visual so love Facebook for all of the pictures but I do not like all of the silly quizzes.
I have to edit my answer. I'm now on Facebook and I like it too! Business-wise, I would say Twitter. Personal-wise, I would say Facebook. (More of my non-blogging friends are on Facebook and I've reconnected with people whom I haven't spoken with since high school!)
Facebook all the way! fun applications, groups etc. More interaction with friends
Teri Ives for Facebook.
scrapnTeri for Twitter. Its boring I hardly update. I like stalking on Twitter more than udpating