Blind compliance to authority. This should be a case study for psychologists, a wake up call to the education system and force a reflection about society. This was put into a movie Compliance (2012) and is covered in Wikipedia's article (http://en.wikipedia.org/wiki/Strip_search_prank_call_scam).
The term 'social software', which is now used to define software that supports group interaction, has only become relatively popular within the last two or more years.
E. Gabrilovich, S. Dumais, and E. Horvitz. WWW '04: Proceedings of the 13th international conference on World Wide Web, page 482--490. New York, NY, USA, ACM Press, (2004)
G. Malik. Proceedings of the 12th International Conference on Conceptual Structures (ICCS 2004), volume 3127 of Lecture Notes in Computer Science, page 213-226. Springer, (2004)