Does chat sometimes inhibit communication?

Some research that I have read on synchronous computer-mediated communication (SCMC) mainly states that it gives the silent students a voice and enables those quieter students to participate more than they normally would.  However, this video demonstrates how sometimes chat might actually cause us to be more timid in our communication–perhaps because we’re not able to take into consideration body language and facial expressions.  At any rate, I thought that this little video is fun and it makes me wonder how much we do hold back when chatting?  What do you all think?