In my social media web app project, I utilized JavaScript extensively to enhance the user experience through dynamic UI updates and efficient data handling. For dynamic UI updates, I implemented features such as real-time notifications and updates using JavaScript's event-driven capabilities. This allowed the interface to refresh automatically without requiring the user to manually reload the page, ensuring a seamless and interactive experience. On the data handling side, I used JavaScript to manage asynchronous requests to the server via AJAX. This enabled smooth data retrieval and submission processes, allowing users to interact with the app without experiencing delays or interruptions. Additionally, I leveraged JavaScript libraries like React to efficiently manage the state of the application, ensuring that UI components were updated in response to changes in data. Overall, JavaScript played a crucial role in making the app responsive and user-friendly.