What is the proper way to handle

* Answers that specifically mention a company's products in a way that obviously is more an advertisement than a real answer
* Answers that refer to a (company's) weblog or web site for further information.

Now most of these cases are so obviously advertisements that I just flag them and check back a few hours later to see whether the posts/user still exist (they don't).

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But what about answers that are (*gasp*) actually helpful and/or relevant? Should we require that they tell us they work/write there? In what way, directly in the post, in the user profile? Or is it enough they provide helpful information and don't care whether it's basically an advertisement for or at least a redirect to their web site? Or should we comment on those posts, to provide additional information for others so they can decide for themselves?

As a current example, I consider [this](https://superuser.com/questions/218269/how-to-clear-font-cache-in-mac/219069#219069) post to be useful, if a bit vague, given the specificity of the topic; but certainly not flag-worthy. The user specified the company blog as his home page, and his user name (JimK) is similar to a poster's name on the blog (Jim Kidwell, "Product Marketing Manager for Font Solutions").