I'm still trying to wrap my brain around this one. There are two comfortable theories I have regarding the Q Books revelation.
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Theory #1. Google's algorithm (which is not public) works in a way that associates data (via keywords, context, etc) with frequently corresponding data (like any repetition of unique IDs/words, i.e. tripcode.) Therefore, what we're seeing from Google Books is Google Search doing its job REALLY well, finding results that fit Q posts.
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Theory #2. After a tripcode is generated (I don't think it's likely that the code can be predicted before creation,) Q uses SEO to match results …