[dheera]

1. If the upvote button somehow stuck on later after navigating to the site, I probably would. I realize this would probably make Chrome even more tied to Google in a potentially slightly evil way though, but it might improve search quality drastically

2. I think Google could do it. They're pretty damn good at detecting bots on Google.com just by analyzing whether your behavior looks human or not, and they also have logic in place to detect fraudulent ad clicks. I think they could do a much better job with fake business listing detection but it's probably just not their focus. Search, on the other hand, is their lifeblood.