Free professional network for scientists. Has useful tools to help - Connect and Communicate: Interact with fellow researchers and build your scientific network. Share and Collaborate: Post updates, discuss methods and co-edit with colleagues. Discover: Download full-text papers, find conferences and scientific jobs.
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.