I develop afresh a comprehensive approach to market segmentation of Facebook users. The approach considers the implications of Facebook’s multi-sided platform (MSP) based business model. Using cluster analysis of survey data, I develop a basic 3 segments solution for the online social networking (OSN) service - infrequent, frequent and engaged user segments. Then I extend the 3 segments solution to factor in responses of users to services of marketers and developers as well. The resulting comprehensive analytical framework for the MSP can help design market segments for all three parties/groups, i.e. Facebook, marketers, and developers.