Block sites from Google search result by New Chrome Extension
With the release of new Chrome extension Personal Blocklist (by Google) you can now block websites from search results with a new experimental Google Chrome extension that attempts to find and block the content farm websites.
The personal blocklist extension will transmit to Google the patterns that you choose to block. When you choose to block or unblock a pattern, the extension will also transmit to Google the URL of the web page on which the blocked or unblocked search results are displayed.