@indyank - I don't know the patent well enough - but what makes you suspect it has some association with crowded spaces?
Crowded spaces are usually the ones that get the most search engine traffic. Google unleashed Pandas and Penguins against "low quality" and "spam" sites respectively. Panda was fed with sites tagged as "low quality", that get traffic for the top 12% of keywords (in terms of search engine traffic). Penguin was fed with sites tagged as "spam". Later Pandas were also fed with long tail data.
People were making a lot of changes in response to the Panda and Penguin attacks. The changes included removing keyword stuffing, bringing down keyword density, removing meta keywords tag, adding more content, modifying titles, changing anchor texts, removing external links etc. But we now have a patent which indicates that they might actually use these panic responses as confirmation for pages (or sites) they have tagged as low quality or spam, using their manual quality raters. Isn't that possible?