Try using Google’s new feature, “SearchWiki”, where you can promote or remove a search result. You have to be logged into your google account to do the promotion/removal, and the action will only affect your search results. But your action will show up as part of the community comments when other people view the results you have promoted/removed.

**Alas, it did not work for my Google Korea search results, I had to switch to English Google to see the effect.

Read this google post for a bit more information.