Alexa Internet was founded in 1996 by Brewster Kahle and Bruce Gilliat. The company offered a toolbar that gave Internet users guidance on where to go next, based on the traffic patterns of its user community. Alexa also offered context for each site visited: to whom it was registered, how many pages it had, how many other sites pointed to it, and how frequently it was updated. Engineers at Alexa, in cooperation with the Internet Archive, created the Internet Archive's Wayback Machine. Alexa also supplies the Internet Archive with web crawls.
In 1999, Alexa was acquired by Amazon.com for about $250 million in Amazon stock.
The company's premises are in Building 37 of the Presidio of San Francisco.
Alexa began a partnership with Google in spring 2002, and with the Open Directory Project in January 2003. Live Search replaced Google as a provider of search results in May 2006. In September 2006, they began using their own Search Platform to serve results. In December 2006, they released Alexa Image Search. Built in-house, it is the first major application to be built on their Web Platform.
Alexa also provides "site info" for the A9.com search engine.
In December 2005, Alexa opened its extensive search index and web-crawling facilities to third party programs through a comprehensive set of web services and APIs. These could be used, for instance, to construct vertical search engines that could run on Alexa's own servers or elsewhere. Uniquely, their Web Search Platform gives developers access to their raw crawl data. In May 2007, Alexa changed their API to require comparisons be limited to 3 sites, reduced size embedded graphs be shown using Flash, and mandatory embedded BritePic ads.
In April 2007, Alexa v. Hornbaker was filed to stop trademark infringement by the statsaholic service. In the lawsuit, Alexa alleges that Hornbaker is stealing traffic graphs for profit, and that the primary purpose of his site is to display graphs that are generated by Alexa's servers. Hornbaker removed the term Alexa from his service name on March 19, 2007. Nevertheless, it should be noted that Alexa expressly grants permission[12] to refer its data in third-party work subject to suitable credits.
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