Blogs focus on whatever subjects their creators care to expound upon. While some are academically rigorous, most are merely personal rants. When bloggers feel passionately enough about a subject, often themselves, they create and regularly update blogs expressing their views, usually including hyperlinks to other Web pages that confirm their opinions. All it takes is some inexpensive and user-friendly blogging software, strong opinions and time. Actual knowledge is purely optional.

And then there’s the stuff that’s purely erroneous:

Blog owners usually don’t allow their readers to add their own comments, preferring their monologues to others’ dialogues.

[link via blogherald]