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Google Groups appear.
In February 2001, Google acquired Deja News, an archive of messages posted to Usenet discussion groups. Its assets were transitioned to groups.google.com where users could access the newsgroups through the Google Groups interface
Google introduces its enterprise search feature - the 'Search Appliance'.
The appliance mapped all the web documents on the network accessible via hypertext transfer protocol (HTTP) in a process known as crawling, then creates an index of those documents.
It used PageRank to analyze the link structure of the network to determine the most important, highest quality pages across all sites. Then for each query, applied hypertext analysis using more than 100 variables to determine relevance.
It searched Microsoft Office documents, PDF, PostScript, and dozens of other file types.
Tabbed categories appeared above the search bar.
Google Answers appears.
Google hired more than 500 'carefully screened' researchers 'ready to answer your question for as little as $2.50 -- usually within 24 hours'.
The online knowledge market allowed users to post bounties for well researched answers to their queries. Asker-accepted answers cost $2 to $200. Google retained 25% of the researcher's reward and a 50 cent fee per question.
In addition to the researcher's fees, a client who was satisfied with the answer could also leave a tip of up to $100. It was fully closed to new activity by late December 2006,