This is interesting:
How Negative Emotion Could Hurt Your Rankings
Google Knows When You’re (Un)Happy
There are dozens of potential uses of stylometry and lexical analysis to improve search quality. Just as Google uses surrounding words to identify what kind of jack I’m talking about, the search engine could also use context to determine whether the adjectives I use in reference to a product, place, or post are positive or negative. . . .
Hundreds of examples prove that Google is picking important sentiments from external websites – not just from review sites like Yelp, but also from sites that don’t necessarily focus on user-generated reviews. Further monitoring over time may be required to properly assess impact on local rankings. It seems clear to me, though, that Google would not go to the effort of determining whether a sentiment was positive or negative and then apply for a patent unless the information is being used in some way. . . .
It would follow that positive citations would improve local rankings, while negative citations could harm rankings.
I think it's likely that Google will do this if they aren't already...
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