Everybody and their mother has a blog these days; and most of these people call themselves journalists. But let's get one thing straight - bloggers and journalists are not the same.
A Blogger is someone who writes targeted content for a specific audience. They may have experience in the industry or just an opinion on the matter. Blogs are free range for opinions to run rampant. When penning a blog there is no necessary writing style or formulas to follow. The facts mentioned don't have to be backed up by reliable sources (although I think they should be.) A blog is a place for conversation and debate. The blogger is the mastermind behind this forum.
A Journalist is someone who usually writes on a specific topic they have a specialty in. They know the facts, the sources, the key players. The articles should be laced with provable facts and written with the hope of conveying truth to the readers. A journalists own personal opinion should not be apparent in the article; it's all about the facts.
The line between these two types of writers are often blurred, which confuses the non-media savy public. When I write for businesses publications I call myself a journalist. I am delivering the facts to a specific market of readers that want to know what is going on. When I publish blog posts I'm a blogger. I fill my paragraphs with my own thoughts and opinions on a certain topic and pose questions for discussion. Bloggers get paid to offer their opinions. Writers get paid to check their opinions at the door.