What are they?
Blog are web source written in diary-style, usually by a single author or group, that allows readers to add comments. Entries are usually listed from most to least recent and are added to regularly. Typically, it is easier to identify the author/creator of a blog.
How should they be evaluated?
Take a few minutes to browse the blog linked on this page. What makes this blog credible?
Things to consider:
If answering yes to these considerations, chances are the blog is a credible source of information. If answering no, then you may want to consider an alternate source of information.