Sharing on the Web

Blogs are an interesting concept to me.  It is a way to share your thoughts about different ideas to a broad audience.  You never know who might end up on your blog, getting to know your feelings about issues, and getting to know what your interests are.  In a way this is somewhat creepy, but it is also good in a way to know that what you write might affect others who read it.  That's why I try to stay positive and inspirational whenever I write something, especially if it's on a social networking site like Facebook.  There's enough drama on these sites already, I don't need to add anymore.
What do you think of blogs?  Do they have a positive or negative impact on society?  Or are they unnoticed because of facebook, youtube, etc?