Lots of references to follow and makes some sensible sounding points for things you might want to consider when design such an interface.
Mueller, F. ‘., Gibbs, M. R., & Vetere, F. (2009). Design influence on social play in distributed exertion games. In Proceedings of the 27th international conference on Human factors in computing systems (pp. 1539-1548). Boston, MA, USA: ACM. doi:10.1145/1518701.1518938ß