A blog is a page run by an individual or group. Informing people on a topic.
I have some experience reading blogs. I don't really know if they're considered blogs or articles. I've always wanted to start a personal blog but never knew how to start or where to begin. 
A blog can be used in the classroom by classmates sharing information with others in their class and working together to complete a goal or helping each other.
http://mycorgi.com/profiles/blogs/sage-and-her-new-buddy-floyd
above is a blog I found about corgis. :)