What's the difference bewteen a blog and a soap box on the corner street?

I'm in the process of writing an article for AFES's monthly 'web-salt' magazine (if any office people read this, don't worry, it'll be in on Monday morning!) and so I'd like to get some thoughts off anyone who is reading or has done some thinking on the topic of blogging and evangelism.

A couple of questions for you to think about in your responses:

Is it possible to preach the gospel over this medium in a way that speaks to an individuals life?

Why/how do we feel as though we can relate to others effectively through this form?

Is it more comforting to sit at a keypad and share your thoughts and feelings than it is to do so in person? Why?

Can it be evangelism if it's just one way? (ie people just reading but not showing any obvious responses either way?)

Any more thoughts or suggestions would be very welcome!