This document summarizes a research project examining the use of social media data by UK police for policing domestic extremism and disorder. The research found that police are increasingly using open source intelligence (OSINT) from social media, which is seen as a more proportionate form of intelligence gathering than other tactics. Police use tools developed by commercial sectors to analyze social media data to identify keywords, risks, influencers and organizers for events like protests. However, the research also highlights challenges around assumptions of public data collection and consent, lack of transparency in algorithms and data analysis, potential for bias, and implications for state-corporate relations.