So how many corporation actually have a blog? There doesn’t seem to be any handy directory to answer this question. There is a blog, however, that tracks blogs for the Fortune 500. You can find it here. What’s interesting is how few large companies actually have at least one blog. According to this index, onl 22 have one or more blogs — 4.4%. So given all the hype about blogs, this number begs the question, “Why so few?”