Any Facebook comment posted on any third-party website has been indexed by Google by Now.
Previously, comments made on Facebook and other social networking sites did not show up in Google searches because search engines were unable to read Facebook's programming automatically. Now, Google will be able to read comments posted on Facebook using Facebook's Connect add-in for other Web sites.
If a Facebook account holder signs into another Web site using his or her Facebook account and leaves a comment, that comment can now show up in Google searches. Comments left on Facebook alone are not yet being indexed.
Facebook and Google may not be having strong professional bonding, but this news of indexing can be seen as good news for the social networking giant. Those who, in view of SEO criteria, were avoiding commenting through Facebook Commenting Box can now use this medium to voice their opinion.