[smoe]

I agree and think it's impossible to foresee every possible "bad" correlation. Furthermore the problem is not limited to advertisement but every type of automated content. E.G. a widget with a generated list of "related stories" or an autocomplete search box.

With more and more of this style of content being used, it is in my opinion important to better inform the not so tech savvy public, that computer generated relations can be really useful but will yield some results that are wrong or might seem distasteful for the human mind.