Crowdsourcing is a new paradigm that has influenced the businesses, emergency management, collaboration and online interaction. The term crowd source means tapping the power of crowd. Research in crowd sourcing involves issues such as quality of data, incentives, working modal and contracts. This research deals with the issues of uncertainty and quality of social mobile computing systems. It suggests the relationship between context and crowd sourcing activity. This understanding can enhance the future and existing applications in a way that it can optimize systems response, adapt the components and decrease the uncertainty.