Pinboard describes itself as "Social Bookmarking for Introverts". It's very clean, simple, fast and has an information-dense UI.
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Pro An ad-free site with no third-party tracking
The standard account is $11/year. The pro account ($25/year) provides you:
- A permanent personal copy of every bookmark you save.
- Full-text search of all your bookmarks
- Dead link and error detection
Pro A searchable archive of all your tweets and favorites
Pro Easy tagging
Pro Excellent API
Pinboard has an API that gives you access to all features used in the webapp, so you can build scripts and apps that work against it very easily.
Pro Built-in sync of links and favorites from multiple Twitter accounts
Pro Built-in integration with Instapaper
Pro A way to save notes and other snippets of text as bookmarks
Pro The ability to bookmark by email from your iPhone
Con Paid service
Costs $11/year, which may be costly to some over free solutions.