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Block Unwanted Referers .htaccess / General Guides
Why would you want to block a referer? Well, for one, there are some sites that use webcrawlers that store a url of a page from that site and transmit it as a referering URL when they access your site. They do this thinking (and hopeing) that the URL will go into a publically available hit log for your website and that the URL will be displayed as a link back to their site resulting in their site getting a higher page ranking in search engines.