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Possible Duplicate:
Is there a way to remove sites permanently from (my personal) Google search results?
How can you configure a browser, and the search agent - e.g. Google - that it uses, to ignore websites like efreedom.com that are just copy-pastes of Stack Overflow?
In the same way there is adblock to block ads, is there any browser plugin that blocks all the noise?
Use Google Custom Search to define your own search that will exclude these sites.
See this section in the help : How can I exclude sites and pages?.
Peter Steinberger has developed a Chrome and Safari extension called "stackoverflowerizer" that automatically redirects pages on efreedom.com, questionhub.com, etc. to the original StackOverflow page. It will rewrite your Google search results (to link directly to SO), but it won't remove the spam sites from Google.
If all you want to do is to prevent yourself from accessing certain domains there are a few options that immediately jump to mind. None of these will stop google returning these sites as results, but you won't be able to access them when it does.
Edit your HOSTS file.
Configure your router (if your router supports blocking of domains).
Use a DNS service that supports filtering and/or blacklisting (such as OpenDNS).
Editing the HOSTS file has the advantage that it will work where ever the modified machine is (so on a laptop if you are constantly moving around it will work everywhere), this may also be the case for the DNS service if you configure it directly on the computer.
The latter two (assuming you configure the DNS change at the router) have the advantage of effecting your entire local network from only one configuration point.
You can try this GreaseMonkey script. I haven't tried it myself, but it was recently updated, so it should updated a year ago, but it will still work with Google's current results page, although instant search needs to be off. Simply edit the script and add the unwanted sites to the list of blocked sites.
Place an entry in your hosts† file that associates the efreedom.com domain names with the ip-addresses of (say) stackoverflow.com.
This won't affect Google's results but clicking them will take you to wherever you have configured.
† e.g. C:\WINDOWS\system32\drivers\etc\hosts on Windows XP.
