Facebook fixes comment threads for Pages and public figures | Internet & Media - CNET News

tbd if the "relevance to each viewer" includes personal purchase histories Facebook buys from others...

"The social network said that it's featuring the most active conversations atop posts, and re-odering the threads by relevance to each viewer. A Facebook member may find a particular conversation thread higher if they share connections to participants in a thread, for instance.
"After months of testing, we have seen how the new feature can improve conversations and be used to start open dialogues with the community," Vadim Lavrusik, Facebook journalism program manager, wrote in a note posted to the social network."

Facebook fixes comment threads for Pages and public figures | Internet & Media - CNET News