Settings: Unindexed Related Posts
Below each post we link to related unindexed posts with this feature. It helps with...
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Discoverability for old content that might not have been seen yet
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Fast indexing of new content
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Providing highly relevant (but usually hidden) content for your visitors
Recommended Setting:
This is a great feature to have on and you’ll very likely get more relevant results with it than WP plugins like YARPP (Yet Another Related Posts Plugin). However make sure you’re using a caching plugin with this feature so WPI doesn’t have to find these posts for every page load.