It depends. If im comfortable, i can talk, quite easily. If i am at a party or something, then minimal. Their are times at work, when i can say minimal things too. It took me a whole 6 months or so to start talking with people in work, 6 months, thats a very very long time. The person i talk the most too, is myself, in my head.
I remember a couple or years ago, we had a BBQ, and invited some neighbours over. We did a fair bit of drinking too. When some people went home to bed, and the kids with them, things changed. I was more like a standup, everything i was saying, everybody was crying with laughter, i dont know why i found it sooo easy to make people laugh so much. The week after, my nextdoor neighbour came over with his girlfriend, i finished work, i just booted up the pc, and they were shouting me from outside to get my butt outside, i eventually did go outside, but when i did, I just sat their, like mute, and nobody was laughing, because i think, they were expecting me to make them laugh. And, because of this pressure, probably made me say nothing what so ever.