Peddlers of gimmicky diet products are now creating fake blogs. These very similar blogs, http://www.aubreysdietblog.com and http://www.tracysweightloss.com may sound authentic but are really a spamvertisement. They are both similar in design and likely to be run by the same person.
Whenever a new medium comes out that a low marginal cost, with no possibility of being punished, we see bad actors starting to take undue advantage. We started with email, Text Messaging, Instant Messenger, Forums, Twitter and now Blogs