When playing a role, I would feel more comfortable, as you're given a prescribed way of behaving. So, both Facebook and theatre provide contrived settings that provide the illusion of social interaction.
One of the most ephemeral and important things is atmosphere and tone and it's very hard to put your finger on what creates that.
From my earliest days I have enjoyed an attractive impediment in my speech. I have never permitted the use of the word stammer. I can't say it myself.