Enable members of your intervention group to share information about their progress, goals and experience with other members and nonmembers. Of seven social media features evaluated for their impact on intervention outcome, sharing resulted in the highest number of positive outcomes. Consider hosting a blog, requesting testimonials or asking members to share photos of their newer, healthier selves.
Elaheebocus, S., Weal, M., Morrison, L., Yardley, L. (2018). Peer-Based Social Media Features in Behavior Change Interventions: Systematic Review. Journal of Medical Internet Research, 20(2), e20.