Citizen science - the involvement of hundreds of thousands of people in the research process -is a radical response to the challenge of dealing with the greatly increased size of modern data sets. Zooniverse.org is the most successful collection of online citizen science projects which have enabled more than 600,000 online volunteers to contribute to a dozen research projects. Zooniverse Project lead Chris Lintott (University of Oxford) will discuss the results from several of these research projects. In particular, Dr Lintott will discuss the growth of black holes in bulgeless galaxies (Galaxy Zoo) and the discovery of previously unknown planets in data from NASA's Kepler space telescope (Planethunters.org). Present and future developments of the Zooniverse platform will be discussed, including the development of a Bayesian machine learning framework to assess volunteer behaviour and thus direct effort more efficiently. Such efforts are critical in coping with data from the next generation of experiments, including the LSST and SKA.