I think many things but I'd say speed of conversation is a big one. On the internet, I think we give people more time to respond than in person. An email, a few

I think many things but I'd say speed of conversation is a big one. On the internet, I think we give people more time to respond than in person. An email, a few days. A HN post, a few minutes to hours. A text message, a few minutes to a few hours. In person? Often a few seconds at most. (Maybe on phone or video call as well) I think the immediacy can make it scarier for many of us to respond.