From the website: Annotate with anyone, anywhere Our mission is to bring a new layer to the web. Use it to discuss, collaborate, organize your research, or take personal notes. From the about page : About us We think simple tools can help us all improve the quality of information on the Internet and in the greater world around us. bq Our team is building an open platform for discussion on the web. It leverages annotation to enable sentence-level critique or note-taking on top of news, blogs, scientific articles, books, terms of service, ballot initiatives, legislation and more. Everything we build is guided by our principles. In particular that it be free, open, non-profit, neutral and lasting to name a few. We create software, push for standards, and foster community.
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From the about page : Stack Exchange is a network of 130+ Q&A communities including Stack Overflow, the preeminent site for programmers to find, ask, and answer questions about software development. Founded in 2008 by Joel Spolsky and Jeff Atwood, the company was built on the premise that serving the developer community at large would lead to a better, smarter Internet. Since then, the Stack Exchange network has grown into a top-50 online destination, with Stack Overflow alone serving more than 26 million professional and novice programmers every month. The broader Stack Exchange Network has expanded to cover topics as diverse as Mathematics, Home Improvement, Statistics, and English Language and Usage.