Facebook Marketplace is evolving as a platform that, despite not being a primary revenue source, is crucial in keeping users engaged on Facebook. Recent changes have pushed users towards the app for messaging, highlighting its dominance in local classifieds. However, some users express frustration over the declining quality of listings, with more 'must go' or vague listings appearing, reducing the platform's convenience. The discussion also touches on competition with local classified sites and the potential for monetization in the future. Meta's focus on ads generates the majority of its revenue, creating a reliance on user engagement through features like Marketplace.