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Science-focussed community with features like forums, Q&A, groups, etc. Includes a PhD students' forum. Community, collaboration, exploration/search.

Quora's service allows users to ask questions and give answers. Additionally, users can comment on the questions and answers and "upvote" or "downvote" the answers. An "Answer Summary" can be created to reflect the consensus of the community. This summary is a wiki that can be edited by any registered user.

a journal management and publishing system that has been developed by the Public Knowledge Project through its federally funded efforts to expand and improve access to research.