I believe it's most unnessesary for any single person to put too much on a single blog. Take the girl from the Chicago high school who would blog about her feeling on African Americans and gay marriages. If she has a problem with something, she should have just kept those feelings to herself; not publish them on the Web for anyone to read.
Then there's the gruop of students from another Chicago high school who blogged about how much they hated a certain teacher and posted threatening blogs towards her. Again, they should keep their feelings to theirselves, but to blog about threatening a teacher is a completely low level to go.