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.