To further curb the problem of content-farms, Google now lets you block websites off your search results. This is quite useful with several sites that only contain keywords that you’re searching for and not much else.

This feature is already available through plugins like Greasemonkey combined with user scripts to “block” specific sites from your search results page so it’s a welcome change to have Google implement it natively with their search page.

As soon as the update rolls out, when you do a search on Google and view the results, you’ll find a new link next to “Cached” that reads “Block all example.com results.” If you click this, you will be prompted with a confirmation message, indicating the block as well as the option to undo your choice.

Once you opted to block a domain, you’ll see this message:

To manage/edit/delete your list of blocked sites, you need to be signed in with your Google Account.

To view your list of blocked sites, you can either visit Search Settings or click on the “Manage blocked sites” link that appears whenever you block a domain.  On the settings page you can find details about the sites you’ve blocked, block new sites, or unblock sites if you’ve changed your mind.

Google says that for the moment, blocking a site will not affect it’s search ranking score but they will be looking at the data put into the service if it’s a feasible measure of site quality.  The new feature is rolling out today and tomorrow on google.com in English for people using Chrome 9+, IE8+ and Firefox 3.5+, and we’ll be expanding to new regions, languages and browsers soon.