Developing basic skills to fly an aircraft requires formal training (I know, I worked in aviation training for several years). However, there is a continuing need for social learning, as is evident by regular CRM (crew resource management) sessions. Malcolm Gladwell highlights the critical aspect of social norms in his book Outliers, in describing what caused several crashes of Korean airlines in the 1980-90's:
http://www.usatoday.com/money/companies/management/profile/2009-08-23-travel-airlines-korea_N.htm

Social learning is not social media.