Social support for physical activity-role of Facebook with and without structured intervention
Translational Behavioral Medicine (2014) - Comment
pubmed: 25584083  doi: 10.1007/s13142-014-0269-9  issn: 1869-6716  issn: 1613-9860 

David N. Cavallo, Deborah F. Tate, Dianne S. Ward, Robert F. DeVellis, Linden M. Thayer, Alice S. Ammerman