What I would use blogs for?

I have been using blog to express my ideas or use it as a diary for several years. I find out that this is a excellent way to share our own experiences or oponions to other people. But how I would use this blog for? First of all, I don't want this blog to be restrained or for marked, I hope I could have the freedom to share some perticulater subject that I think is interesting or significant to me,such as movies, books or music. It will inculde the introduction of the subject and also my oponions. Through this blog, it will certainly shows my thought and my personality.