Analyses of Facebook security incidents, such as the 2018 Cambridge Analytica scandal and the 2021 data scraping, highlight critical lessons regarding third-party risks, "privacy by design" deficits, and the exploitation of legitimate features for data harvesting. These breaches often involved "dark patterns" and led to significant user distrust and, in some cases, long-term shifts in advertising engagement, despite a general trend of users remaining on the platform. For a detailed breakdown of the 2021 incident, see this article from Twingate .