Hateful, threatening or degrading content has become a common part of today’s online interactions. However, little is known about the people who produce such content. This study analyzes online hate content production and its associations with cognitive indicators of social capital in both offline and online social networks. The data are derived from American, Finnish, German and British Internet users aged 15–30 (N = 3,565). Measures included questions concerning online hate, social capital and contextual control variables. The results indicate that hate content production is rare overall, despite its high visibility, and is related to social capital in two key ways. First, respondents with high social capital in offline social networks were less likely to produce hate content, and second, high social capital in online networks was associated with a higher probability of production.