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History
The concept of shared online bookmarking dates back to April 1996 with the launch of itList.com. Within the next three years online bookmark services became competitive, with venture-backed companies like Backflip, Blink, Clip2, Hotlinks, Quiver, and others entering the market. Lacking viable models for making money, most of this early generation of social bookmarking companies failed as the dot-com bubble burst. The contemporary concepts of social bookmarking and tagging took root with the launch of the web site del.icio.us, in September of 2003.
Functional Overview
In a Social bookmarking system, users store lists of Internet resources, which they find useful. Often, these lists are publicly accessible, and other people with similar interests can view the links by category, tags, or even randomly. Some social bookmarking systems allow for privacy on a per-bookmark basis.
They also categorize their resources by the use of informally assigned, user-defined keywords or tags (see folksonomy). Most social bookmarking services allow users to search for bookmarks which are associated with given "tags", and rank the resources by the number of users which have bookmarked them. Many social bookmarking services also have implemented algorithms to draw inferences from the tag keywords that are assigned to resources by examining the clustering of particular keywords, and the relation of keywords to one another.
Advantages
This system has several advantages over traditional automated resource location and classification software, such as search engine spiders. All tag-based classification of Internet resources (such as web sites) is done by human beings, who understand the content
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