The simple answer is that SEO is a complicated subject. Because it’s complicated, two things end up happening:

1. Companies selling SEO services say “Blogs help SEO,” because it’s a thousand times easier than explaining why blogs help SEO, or that some blogging platforms will actually hurt your SEO, or that the same can be accomplished in Dreamweaver or another web publishing platform (albeit not as efficiently). When it comes to selling, keeping it simple helps.
2. Companies who take the blogging plunge tend to notice their traffic increases. Because SEO is a complicated subject, the easiest explanation is that the blog did it. Then, when you talk to employees in those companies, they tell you how much of an impact blogging made on their business…and the