I would rather be quiet if I don't have anything smart to say. I know people who are constantly trying to get as much people around them as possible and just keep their mouth open... sometimes I can't believe all the stupid sh*t they say.
Same people think that I'm quiet because I am not trying to outscream them... guess it's a weakness of mine that I can't talk in big groups of people, I'm more of a one on one person... and there is nothing wrong with that.