Marcel Weiss's Library tagged duplicatecontent →  View Popular, Search in Google

This is a free service designed to monitor your RSS feed and find where your content has been republished in the blogosphere. We automatically notify you when a new post of yours is copied to another feed, we also build an overview page you can view to see how/when/where your content is being duplicated, quoted or plagiarized.

 2. place the file duplicate-content-cure.php in your plugins directory
 3. By default, category pages will have the noindex tag added. If you wish to
 allow your category paes to be indexed, just change the
 $index_category_pages variable in the duplicate-content-cure.php file. See the example below:

 

Change
 $index_category_pages = false;
 to
 $index_category_pages = true;

 

4. activate it on the plugins page

 

That’s it. Say goodbye to those pesky duplicate content pages for good.