On Feb 25, this year, Goolge introduced "Ranking Algorithm" a.k.a. "Panda Update", a Chrome extension and a feature in Google Search where you can hide sites you may deem not useful from your search results.
Today, the search team announced of adding an export feature of your block sites from the Chrome extension to your Google account.
"By storing your personal blocked sites list with your Google account, Google hides these sites from your search results when you're signed in. Also, you can manage your list in a central place, regardless of the browser or computer that you're using or the extensions that you have installed," informs Ray Zhong, Search Quality Engineer.
"To get started, click on the red button with the extension logo in Chrome, then select 'Export' from the screen that shows your personal blocklist. Then, click the 'Export to Google' button. The next prompt asks if you'd like to disable the extension, since the list of blocked domains has now been uploaded to Google and will be used for signed-in searches. You can re-enable it later if your change your mind. In the final step, you review the sites that you want blocked and confirm the export to your Google account," explains Zhong.
Adding Zhong said, "The sites that you export will be hidden from your searches while you are signed into your account. You can unblock or manage the blocked sites at any time in the Search Settings Blocked Sites screen."
For more information, you can see this help page on the blocked sites feature.