Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
Yahoo! Answers debuted in December of 2005 and almost immediately enjoyed massive popularity as a community driven website and a source of shared knowledge.
Yahoo! Answers provides a very simple interface to do, chiefly, two things: pose questions to a large community (potentially, any active, registered Yahoo! user—that’s roughly a half-billion people worldwide); or answer questions that others have asked. Yahoo! Answers was modeled, in part, from similar question-and-answer sites like Korea’s Naver.com Knowledge Search.