I've received email messages from people who are baffled about my recent blogging posts, specifically Create a Marketing Blog. To them, a blog is an online journal, someone waffling about this and that.:-)
I'm not against such personal online journals, but the blog FORM/ TOOL is not the content.
A blog is an instant online publishing tool. You can publish with your blog as fast as you can type, or copy and paste. You can publish any content you choose.
Think of a blog as being like a word processor. In Microsoft Word, or whatever word processor you use, the content of your documents is up to you. You can write poems, price lists, newsletters --- anything at all. Just like a word processor application, your blog application is not fussy about the content. You decide the content. :-)