Pinboard has a plain design and a focus on personal management of bookmarks using tags to organize them, similar to early versions of the Delicious social bookmarking service
A free social networking and micro-blogging service that allows users to send updates (known as plurks) through short messages or links, which can be up to 210 text characters in length (previously 140).
The site was bought by Avos Systems on April 27, 2011, though was operated by Yahoo! until July 2011.[3] On June 1, 2017, Delicious was acquired by Pinboard, and the service will be discontinued. As of March 2018, the website is read-only.
Trackle offered a variety of information categories that users could keep tabs on and share like-interests with groups of users via Twitter, SMS, and Email.
Owned by NBC, Community-powered which hosts content from its users and syndicated content. Discontinued on October 1, 2017, redirected to NBCNEWS web page
Syncs bookmarks (folders & sub-folders) and profiles across different browsers and platforms. Includes sharing option and possibility to access bookmarks via web-based interface. On May 1, 2018, Xmarks was discontinued after being acquired by LastPass.