As long as we distinguish between 'advertising product placement' and 'this is the normal sort of thing Konata would be chatting about' .... just the use of fad items is okay if it is in context because this is what these sort of people would actually discuss.
Rather like "Want a Coke?" is not an inherent product placement.
In a real sense, *ALL* anime is advertising --- they want us to buy the manga, the figures, and CDs, DVDs....
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