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SEO Referrer Link Ping Plugin is an implementation of the SEO principle of pinging referrer links to your website based on the article originally appearing on <a href="http://bluehatseo.com/blue-hat-technique-18-link-saturation-w-log-link-matching/" title="Link Saturation with Log Link Matching" rel="nofollow ugc">Blue Hat SEO</a>.
The general idea is to achieve a referrer link saturation rate of 100% to boost your SEO footprint. Link saturation is the percentage of links indexed by search engines versus actual total links. For example, you may have 100 referrer links to your site coming from other websites but only 44 of those might be indexed by search engines. In such a case you would have a referrer link saturation of 44%.
Installing SEO Referrer Link Ping Plugin will cause all referrer links to any page in your WordPress site to be submitted to <a href="http://pingomatic.com" title="Pingomatic pinging services" rel="nofollow ugc">Pingomatic</a> pinging service automatically behind the scenes. The hope is these referring links will be indexed by the major search engines if they aren’t already.
When activated, any time a web visitor clicks through to your site from an external domain, SEO Referrer Link Ping Plugin will submit that referring link to Pingomatic to make sure it gets indexed by search engines.

SEO Referrer Link Ping

Automatically ping all referrer links for an SEO boost.

SEO Referrer Link Ping vs W3 Total Cache