Facebook analytics allow us to use complex search terms. Facebook Graph Search was just one of the ways, one could deep dive into the hidden patterns of the largest social community. Graph Search was almost entirely deprecated in June 2019 but commercial Search and Analytics offerings allow custom search queries regarding any topic, that´s relevant to the individual community.
Facebook is the ideal playground for black-hat and white-hat analytics and initiatives. I have tried to outline pieces of the Information Warfare process in the article The information warfare by Cambridge Analytica and others.