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Facebook has given us an update on its latest test for page post comments: in addition to a new option to reply to specific comments, the entire thread will be sorted by an algorithm to put the most engaging comments higher.
These changes make comments on page posts more similar to Facebook’s comments plugin for third-party sites, which have had threaded conversations and a ranking algorithm since March 2011. It makes sense to bring these features to page posts where there can be dozens or even thousands of comments, and users cannot tag and mention other fans they aren’t friends with. If Facebook rolls out these changes more widely, pages may see increased engagement on posts since high-quality comments will be surfaced up top and users will be notified when someone replies to their comment.
Facebook 'Comments On Page' Test Is Like a Web Plugin With Ranking Algo [insidefacebook.com]