Common TechniquesTwo common techniques are #1 using a web crawler or #2 user submissions.
ExamplesGoogle GroupsOn February 12, 2001 Google acquired the Usenet discussion group archives from Deja.com and turned it into their Google Groups service [1]. They allow users to search old discussions with Google's search technology, while still allowing users to post to the mailing lists. Internet ArchiveThe Internet Archive (official website) is building a compedium of websites and digital media. Starting in 1996, Archive has been employing a web crawler to build up their database. They are one of the best known archive sites. TextFiles.comTextFiles.com is a large library of old text files sustained by Jason Scott Sadofsky. Its mission is to archive the old documents that had floated around the bulletin board systems (BBS) of his youth and to document other people's experiences on the BBSes. PANDORA ArchivePANDORA (Pandora Archive), founded in 1996 by the National Library of Australia, stands for Preserving and Accessing Networked Documentary Resources of Australia, which encapsolates their mission. They provide a long-term catalog of select online publications and web sites authored by Australians or that are of an Australian topic. They employ their PANDAS (PANDORA Digital Archiving System) when building their catalog. See also
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