[tek]

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I think it is better to sit motionless and silent regardless whether I am bluffing or have the nuts. Why give any information?

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If you try to have a "poker face" then any deviation will be a potential tell and therefore counter-productive. With more experience one can have chats in tourny's just like in live cash games and not give tells.

And by chats I don't mean asking stupid questions like "...you hit your draw" or "...you got Aces dude".

I mean actual chatting. When you play enough live events, it gets boring sitting like a statue (which marks you as potential noob).