Bystander programs contribute to crime prevention by motivating people to intervene in violent situations. Social media allow addressing very specific target groups, and provide valuable information for program evaluation. This paper provides a conceptual framework for conducting benefit–cost analysis of bystander programs and puts a particular focus on the use of social media for program dissemination and data collection. The benefit–cost model treats publicly funded programs as investment projects and calculates the benefit–cost ratio. Program benefit arises from the damages avoided by preventing violent crime. We provide systematic instructions for estimating this benefit. The explained estimation techniques draw on social media data, machine-learning technology, randomized controlled trials and discrete choice experiments. In addition, we introduce a complementary approach with benefits calculated from the public attention generated by the program. To estimate the value of public attention, the approach uses the bid landscaping method, which originates from display advertising. The presented approaches offer the tools to implement a benefit–costs analysis in practice. The growing importance of social media for the dissemination of policy programs requires new evaluation methods. By providing two such methods, this paper contributes to evidence-based decision-making in a growing policy area.

In 2008 European Commission launches the open access infrastructure for research in Europe project (OpenAIRE), supporting open access (OA) in scientific information and research output. In this paper, we assess the economic sustainability of the OpenAIRE project. The empirical strategy is developed through a Cost–Benefit Analysis framework to evaluate and compare the costs and benefits of OpenAIRE services to provide recommendations on the project’s economic efficiency and sustainability, a non-market valuation method based on the results of a “Choice Experiment” to calculate the Total Economic Value generated by OpenAIRE and a full preference ranking approach. Findings indicate that stakeholders prefer interoperability between research platforms and output, better access to scientific results and compliance to OA mandates. Furthermore, net social benefits for the basic services for 15 years are at least five times higher than costs’ present value while the potential R&D effect from research suggests even larger benefits in the long run. Subscriptions based on the estimated willingness to pay and cost, institutional subsidies and public awareness are the main recommendations for the sustainable operation of OpenAIRE. This study contributes to the literature on monetary valuation of the benefits and costs of OA to scientific knowledge.