Maybe part of it is just that typing text into a post doesn't viscerally feel like standing in front of a group of hundreds of people and shouting over a megaphone. I noticed that in myself when I first got into Facebook way back - when it was still novel, I tended to post 'stream of consciousness' type stuff. You intellectually know that your post is going to be seen by a lot of people, but _in the moment_ it doesn't _feel_ like that.

I imagine that many people have a similar experience. You're yelling into a megaphone but it feels more like you're writing an entry in your diary.