NET TRENDS: Fresh and Stale on the Web

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Science  12 Jan 2001:
Vol. 291, Issue 5502, pp. 215
DOI: 10.1126/science.10.1126/SCIENCE.291.5502.215B

Frustrated by yet another dusty, neglected Web site with pages “last modified” in 1997? If fresh content is what you're seeking, then forget government and university sites and stick to the dot-coms. That's the upshot of an analysis of 270 popular sites. Stanford computer scientists Hector Garcia-Molina and Junghoo Cho checked more than 3000 pages on each site daily for 4 months to gauge how frequently Internet search engines such as AltaVista need to “crawl” the Web to update their databases. Not surprisingly, the dot-com sites were refreshed significantly more often than those run by the nonprofit sector.

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