StackOverflow and the StackExchange network are completely free to read and accessible without a login. The SE sites don't require anything but an e-mail to sig

StackOverflow and the StackExchange network are completely free to read and accessible without a login. The SE sites don't require anything but an e-mail to sign up and allow you to participate pseudonymously. When using the SE sites, the feeling of it being a community effort is a fairly clear one, I think. Quora, by its nature of focusing on the real-world reputation of its users, is much more aggressive regarding personal information, and does not feel like a community effort to the same extent (you can't edit other people's answers, etc.).