The study participants who are more active on Facebook, showed less need to share, to help others, and society.
They showed greater selfishness.
Wen Bin Ch., Szu-Wei Ch,. Da-Chi L. (2013) Does Facebook Promote Self-Interest? Enactment of Indiscriminate One-to-Many Communication on online Social Networking Sites Decreases Prosocial Behavior. Cyberpsychology, doi: 10.1089/cyber.2013.0035