Beneficial:
- Learning
- Knowledge sharing
- Diverse perspectives
- New member recruiting

Negative:
- Competition of membership

University of Michigan - Ann Arbor

- Zhu et al. show that community survival increases as membership overlap increases
- Their hypothesis that there is a curvilinear relationship between membership overlap and community survival was not confirmed 

Effects of membership overlap in online communities

Zhu, H., Kraut, R. E., & Kittur, A. (2014, April). The impact of membership overlap on the survival of online communities. In Proceedings of the SIGCHI conference on human factors in computing systems (pp. 281-290).

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