Table 4.

Characteristics of Social Media Health Challenges

Challenges	Chung et al. (2017)	Epstein et al. (2016)	Kaipainen et al. (2012)	Hutchesson et al. (2013)	Matwiejczyk et al. (2015)	MacNab & Francis (2015)
Use of the term intervention	-	Yes	Yes	Yes	No	Yes
Dimension	Eating	Eating	Eating (mostly)	Eating and physical exercise	Eating	Eating and physical exercise
Challenge objective	Weight change	Weight change	Weight change	Weight change	Weight change	Weight change
Most reported characteristics	Considerable technological support and sub-tasks	Considerable technological support and sub-tasks	Considerable technological support and sub-tasks	Considerable technological support and sub-tasks	Considerable technological support and sub-tasks	Considerable technological support and sub-tasks