Lighthouses in the night : the information retrieval on the Internet

The Internet is itself, and more specially in the information field, a nebula, a labyrinth, within which it is very difficult, even impossible, to recognize one's way without any marks. Search engines have been developed since 1995 to analyze the millions of existing sites, and to make a well-balanced appreciation, destined to make a good selection of what is available on these new electronic medias.
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