SEO No Duplicate Wordpress Plugin - Rating, Reviews, Demo & Download
Plugin Description
This simple plugin helps you easily tell the search engine bots the preferred
version of a page by specifying the canonical properly within your head tag.
Why would you do such a thing? Simply because many black-hat SEO folks abuse
duplicate content to gain search ranking and search engine try really hard to
detect and penalize them. The last thing you want to do is present yourself as
an SEO spammer to search engines.
WordPress 2.9+ includes rel=”canonical” header settings by default but the
feature only works properly on singular posts (not category or archive pages).
So for example:
The second page of your homepage should actually have its canonical URL set to:
“http://example.com” instead of “http://example.com/page/2”
Using this plugin solves the above issue in WordPress 2.9+.