Flipboard

Flipboard is a social magazine platform where users can discover, collect, and share content from across the web. It allows individuals to curate articles, videos, and other media into personalized 'Magazines' based on their interests. These Magazines can be made public, enabling users to share their curated content with a wider community and connect with others who share similar passions.

Flipboard is a well-established platform that allows users to curate content into 'Magazines,' which are essentially collections of URLs. It supports saving various media types, organizing them into themed collections, and sharing these collections publicly. The platform emphasizes a clean interface and offers user profiles. While it doesn't explicitly mention 'Tufte-style side notes,' users can add captions and commentary to their 'flips' (saved content), which serves a similar contextual purpose. The core functionality of saving, organizing, and sharing web content aligns strongly with the URList concept.