A social software wiki page on design patterns for social software, categorised under trust and identity, collaboration, and communications. Click through twice to get to a longer list of patterns. Output from social software course.
X. Jin, C. Cheung, M. Lee, and H. Chen. Computers in Human Behavior, 25 (5):
1172 - 1181(2009)Including the Special Issue: Design Patterns for Augmenting E-Learning Experiences.