I follow blogs. Some of them belong to people I know, some do not. Often I read something I like and start to comment on the post, but after typing a few lines, delete the comment completely. I get a little shy. What if this person doesn't know I read their blog? What if they don't think what I have to say is witty, interesting, or funny?
Sometimes I wish I could do this in real life. It would be convenient if something didn't come out quite the way I wanted, I could just hit backspace and delete it. That would be nice.