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They are increasingly moving to deep learning / neural nets, and probably random forests. The thing about deep learning is that you train it on data sets (this site is good, this site is bad) and it figures out its own reasons. It's increasingly becoming the case that even the engineers don't know why it made a certain decision. It's a black box and you can't really inspect it. They'll still keep the generic features everyone knows but they seem to be giving more and more weight to the AI aspects.
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