- Stack Overflow is 10x the traffic (daily visits) as the next-highest site.
Stack Exchange is a network of question-and-answer websites on topics in varied fields, each site covering a specific topic, where questions, answers, and users are subject to a reputation award process. The sites are modeled after Stack Overflow (started 2008), a Q-and-A site for computer programming questions that was the original site in this network. The reputation system allows the sites to be self-moderating... In May 2010, Stack Overflow (as its own new company) raised US$6 million in venture capital from Union Square Ventures and other investors, and it switched its focus to developing new sites for answering questions on specific subjects... In March 2011, Stack Overflow raised US$12 million in additional venture funding... Notable parts of Stack Exchange include sites focused on physics, video games, and patents.
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