Update #3: David Crane, the big PR cheese wrote back a few seconds ago and had this to add, “Google’s global properties were unavailable for a short period of time earlier today. We’ve remedied the problem and access to Google has been restored worldwide.”
As uncovered by search industry sleuth Gary Price, Google registered with the U.S. Patent and Trademark Office in March for the mark TrustRank, a term linked to mathematical algorithms for eradicating Web spam.
換句話說,Google 也認為 nofollow 只是一個替代性的方案,對付 Web Spam 還是要靠自動化的 algorithm 分析處理。