Google’s site blocking feature was announced on the official Google blog on March 10, 2011. It allows users logged into their Google account to avoid seeing search results from specific sites.

Most users began noticing a new link on their Google search results pages, offering to ‘Block all example.com results’ when the user returns to the results page immediately after clicking a result link. A site blocking management page allowed users to add and remove blocked sites directly.

Unfortunately, many users (including myself) are finding that these features are no longer working. In my case, the option to block results from a site on the search results page has stopped appearing, and although the existing blocked sites still appear to affect my search results, I can no longer add new blocks on the management page.

The problem may be related to Google’s push to switch over to secure HTTP for all of its services – at least for logged-in users. Other reports indicate that the new ‘Search Plus personalized results format’ may have broken this feature.

Some sites are reporting Google’s official stance on this issue as “we’re working on a fix but it may take a while.” I have been unable to verify this.