Social bookmarking applications/services help people pool their [[web]] bookmarks. The most popular of these applications was [[del.icio.us]], but it seems to have been caught by [[digg]], at least in the [[Alexa]] rankings.

Note that many of these applications are not [[open source]], but [[proprietary]] web applications, whose developers keep their original source code to themselves. However many of them are built on underlying open source frameworks such as [[Rails|Ruby on Rails]], [[Tomcat]], [[Python]] and [[Perl]].

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