Jeffrey Rosen's NYT article: "Your Blog or Mine?" points out the dangers of personal blogging.
Money quote:
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Without a reputation for trustworthiness, neither friendship nor journalism can be sustained over time.
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The article focuses on personal blogging, but every blogger should realize that your blog is FOREVER. Even if you take down the blog, it will linger on in Internet databases forever. As a rule of thumb, never blog anything you don't want your best friends and worst enemies to read on the front page of a newspaper.
In 2020, do you want a blog posting you made in 2004 to be read out to you at a job interview? Could happen.