Citizen science refers to efforts to promote participation of the general public in scientific research. Natural scientists broadly celebrate the potential of citizen science to generate data at previously undreamed of scale (and at little cost). However, natural scientists have worried about the quality of data produced by citizens who lack scientific training, and question the objectivity of contributors who may be driven by value-laden goals. In this talk Quinn will analyze these worries, linking to philosophical models of objectivity and the appropriate relationship between science and social values.