So I was applying concepts from meathead1234's method and found this in the search results. FB Pages auto-generated judging from the page names which are just random slugs and the content which is horribly spun. Using meathead's method means that I use site:facebook.com + "keyword" and narrow down to past 24 hours to post comments on those results manually. Works like a charm by the way. So does this imply that the advanced search results are worth targeting now? They dominate the search results for 20 pages or so. But most internet users aren't that savvy to refine their search. Or they know but couldn't be bothered. Whatever the case, looks like I can't use the method on FB anymore in this niche at least.