Neat, but this isn't a complete solution as I, and many others, use Firefox. I can't see a good reason this needs to be an addon instead of a user setting, other than to only allow only Chrome users to use the "official" add-on. There is a Firefox version that, perhaps a bit tongue-in-cheek, is called "Personal Blocklist (not by Google)". I keep the number of addons I install to a minimum so will be sticking with my keyword searches (I actually filter Pinterest from my searches).
