I don't think ranking on facebook search has anything to do with SEO. Facebook search is a way to find people, communities and pages inside facebook. facebook search does show results outside facebook
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I agree, Facebook ranking is easy and not complicated, once you search for a keyword it will bring out all related names , products and pages .Ranking on facebook works on simple metrics, for example the name used for the page or group,and the hash tags. Let say you are trying to search keto diet on facebook. Facebook will display the pages or groups using keto diet on the name, or the content using keto diet hash tags.
Facebook don't allow that to happen I guess, everything you are searching for in Facebook is inside it, because it will never take you out of is platform I guess.So this may be an odd question, but is it possible to rank in Facebook's search? I know Facebook now lets you search for many things, mostly all housed on Facebook of course, but it seems to heave a wealth of information at ones fingertips. With that being said, is it possible to rank on Facebook Search? Or does facebook only search for content on facebook?