What is Social bookmarking?

[Jeffreyhooft]

Social bookmarking services support users to gather and promote their most favorite web sites online. These sites can help to save people lots of time and effort for finding, organizing and sharing web sites.

[Randalerarm]

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

[Martinusemi]

Social bookmarking is a method for web users to store, organize, search, and manage bookmarks of web pages on the Internet with the help of tags or keywords on sites such as Digg or Del.icio.us. This helps you in accessing bookmarks from any computer with online access.