Facebook or twitter, what's best?

I have been using facebook a while but suddenly i have been hearing that twitter scores the audience attention. Why?

Questions have been asked and answer have been "well, answered". Although i don't really get twitter. It sounds like it's "holding people inside on a great sunny day" This is altough my second blog post this day but i don't get this whole thing. I prefer facebook like all my great class mates... but you'll never know, it might change.