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:
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.