I'm afraid I don't have a link to one — but I'd certainly love to see a piece that focuses on Google's portfolio. Even better would be a bigger, more comprehensive project that compares Facebook's patents to Google's, qualitatively. Both companies stand apart from the rest of the tech giants in their possession of enough personal data to exploit these patents — it would be fascinating to see if a trend or a significant difference could be discovered in the types of personal surveillance they're describing.