Stephanie Sandifer wrote
an informative post about
stu.dicio.us, an online tool that "provides a very simple to use interface for keeping class notes."
In the comments of the post, "Josh" writes two comments that are blatant advertisements for his website.

Neither of his comments add to the educational nature of the discussion.
When does a discussion of a product (or a website or any other professional service) turn into an unacceptable advertisement?- As the owner of a blog, what should one do to discourage such behavior?
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