These are the sites that I often use:
http://scholar.google.com/scholar_preferences?hl=en&as_sdt=0,33
http://www.90searchengines.com/texis/open/allthru?area=aboutus
Article about Jerry and David, and story behind DMOZ:
http://docs.yahoo.com/info/misc/history.html
http://www.dmoz.org/docs/en/about.html
Additional search engines that I never new about:
http://www.mamma.com/about.php
http://www.altavista.com/about/
Good sources and information on Social Media:
http://webtrends.about.com/od/web20/a/social-media.htm
http://www.socialmedia.biz/about/
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