Build a social news aggregator site using Kotlin programming language that displays popular news stories and articles from reliable news sources across various categories such as business, technology, health, sports, and entertainment. Implement user authentication and registration features to enable users to create personalized feeds, save articles, and engage in discussions by commenting and sharing articles on social media platforms. Ensure that the site is mobile-responsive and has a clean, modern user interface with intuitive navigation to enhance user experience. Also, integrate a search functionality with filters to enable users to easily find relevant and recent news articles.
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