Crawlable Facebook Comments
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A lot of blogs are beginning to use facebook comments. I came across a WordPress plugin called "Crawlable Facebook Comments". The plugin makes a text version of your iframe comments visible to googlebot. You can see how it works at: http://www.zewlak.com/crawlable-facebook-comments/ Is there really any utility to this seo-wise? Comment content is normally not optimized and you will end up linking to a bunch of facebook profiles. What do you folks think?
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User Generated Content such as comments have been proven to add value to articles. You can capture a lot of long tail phrases.
With respect to linking facebook profiles, that is entirely under your control. The plugin should provide you the option to only present the comments without linking to the facebook profiles. If it doesn't, either modify the plugin or find a different one.
Some relevant discussion:
http://www.seomoz.org/blog/make-facebook-comments-box-indexable-by-search-engines