Chemistry.org/exchange

"Chemistry.org/exchange is user-driven scientific content: you can share, vote, and comment on articles and news among a global community. Chemistry.org/exchange is a scientific community: create a profile, assign tags (keywords) to your account, and find and network with other registered users. Chemistry.org/exchange is an article repository: start a library of scientific research that's important to you--publications you've authored, or articles that furthers your research"