Pinboard

Pinboard is a fast, privacy-focused social bookmarking service that allows users to save, organize, and share web links. It offers features like full-text search, archiving of bookmarked pages, and integration with other services like Twitter and Instapaper. The service operates on a paid subscription model with no ads or trackers.

Pinboard is a social bookmarking site that allows users to save, organize, and share links. It emphasizes speed, privacy, and a minimalist design. It offers features like URL saving with archiving (which implies preview capabilities for saved content), organization through tags (which can be seen as sections), public and private sharing, and a user profile page. While it doesn't explicitly mention 'Tufte-style side notes,' it does have a 'notes' feature for snippets of text, which serves a similar purpose of adding context. The site also highlights its mobile-friendly design and API for integrations, which can support embedding.