There are people who don't?

Scratch that. I know one person who doesn't. ESFP SEE 4/7 so-dom sanguine. She has *no* verbal filter. She openly admits it too. It gets her in real trouble...

As for me, I always approach social interaction as having a goal, to interact positively with another. So I suppose I construct facades, only because whatever I'm thinking at the moment is not applicable to the conversation I wish to be having.