It’s very annoying when you find spam sites or non related with your keyword on Google Search. In fact spam sites located on top position on page 1 or page 2. Although Google is continuing to remove the spam sites you can also do it by your self by using Personal Blocklist add-on for Google Chrome web browser.
Google said that the extension also sends blocked site information to Google, and we will study the resulting feedback and explore using it as a potential ranking signal for our search results.
You will not see a site that you’ve blocked with the extension in your Google search result. You can undo blocks site at the bottom of the search results or by clicking on the extension’s icon in the top right of the Chrome window.
Download Blocking Sites add-ons from Chrome