On 2 July 4 members of the IERG team, Tom Sorell, Kat Hadjimatheou, John Guelke and Christopher Nathan, presented papers at the College of Policing as part of a 1-day Senior Leaders Masterclass on Big Data and Social Media. Christopher Nathan’s presentation considered the privacy implications of big data analysis; John Guelke’s the risks to privacy of social media monitoring by police; Tom Sorell’s the broader issues arising from social media use both by police and the public; and Kat Hadjimatheou’s the possibilities for ethical guidance for police using big data applications or social media. Other presentations were given by senior police officers, a communications industry representative, and social and computer scientists developing bid-data applications for police