Here's a link to a post from the Lori Perkins Literary Agent Blog, Agent in the Middle. It deals with some advice I think is important for anyone starting out as a writer and looking for information about publication.
What's the difference between a blog and a post? I see people making this mistake all the time. Is it a big thing in the grand scale? No! But when writers make these mistakes it does cause people stop and think about how savy they are when it comes to online communication. Personally, I think it's important to get the terms right.
In other words, a blog is a web site where you post information. What you're reading right now (this article) is a post, not a blog. You're reading the post on the blog.