Social bookmarking

    According to Wikipedia a social bookmarking service is a centralized online service which enables users to add, annotate, edit, and share bookmarks of web documents.

    In a social bookmarking system, users save links to web pages that they want to remember and/or share. These bookmarks are usually public, and can be saved privately, shared only with specified people or groups, shared only inside certain networks, or another combination of public and private domains. The allowed people can usually view these bookmarks chronologically, by category or tags, or via a search engine.

    There exist a number of such sites (List of social bookmarking websites). We worked with Delicious. 
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