What is this...

I am clearly not comfortable with any type of chat, blogging, facebook etc. Why would you want to give just anyone access to your thoughts? When I was presented with the idea of taking a course that would make me do just that it terrified me. What do I have to see or want people to this see that would interest them? It is not easy sharing thoughts and feelings about subjects for others to see. I still perplexed about this whole pheonmenon