Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Jinwei Cao, Janna M. Crews. Impacts of social presence on user interaction with learning support systems. Int. J. Knowledge Learning, 5(2):172-192, 2009. [doi]