Blogging is where you write an article or two every day, and it really does have to be at least one a day, about an issue.
Usually blogs attempt to develop a community of readers, all of whom get to discuss each post on the blog site.
Blogs are mostly used to discuss political and social issues. The comments are wide-ranging and often become shouting matches.
If you want to push an issue, to get people excited about something, a blog is great.
If you're trying to sell something, you'll either wind up with silence (which is bad) or people shouting and complaining (worse).