Activity feeds serve as a real-time stream of updates in applications, significantly enhancing user engagement by providing critical information and facilitating collaboration, especially in complex B2B SaaS environments. They act as centralized hubs that keep users informed of relevant changes, improving productivity by reducing the time spent searching for updates. Successful integration of activity feeds requires careful design to ensure relevance and personalization without overwhelming users, thereby supporting seamless information flow and enhancing user success within the application. Examples from companies like HubSpot, Atlassian, and Drift demonstrate how activity feeds can vary in design and functionality, offering personalized content, interactivity, and contextual information, all aimed at boosting user engagement and retention. However, challenges such as scaling, design complexity, and managing the signal-to-noise ratio must be addressed to prevent user frustration and maintain the effectiveness of the feed. Activity feeds, when executed well, provide substantial benefits by promoting efficient workflows and increasing user interaction, which ultimately supports both users and the product.