Welcome to Pinboard—Social bookmarking for introverts!Pinboard lets you bookmark from any browser, connect up Twitter accounts (and favorites), and sync with popular services like Instapaper or Pocket. For a few more bucks a year, Pinboard offers an archiving service which saves a copy of everything you bookmark, gives you full-text search, and automatically checks your account for dead links. Take a quick tour of the site to see if it's right for yo
Diigo - social annotation and social bookmarking
