Facebook Comment Cache
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This module grabs comments written at Facebook about a certain node with the social plugin of Facebook. Comments will be cached on your website to have a SEO advantage because the Social plugin shows the comments through an iframe.
Facobook recommends to do that for SEO boost (https://developers.facebook.com/docs/reference/plugins/comments/):
How can I get an SEO boost from the comments left on my site?
The Facebook comments box is rendered in an iframe on your page, and most search engines will not crawl content within an iframe. However, you can access all the comments left on your site via the graph API as described above. Simply grab the comments from the API and render them in the body of your page behind the comments box. We recommend you cache the results, as pulling the comments from the graph API on each page load could slow down the rendering time of the page.
Read installation instructions at README.txt.