To Share or not to Share? discusses the motivations and constraints researchers face in sharing their data. There are benefits to sharing such as increased citation and collaboration opportunities, but also constraints like lack of time, funds, desire to maximize commercial value from the data, and concerns about inappropriate use. Sharing practices vary significantly across disciplines and countries due to differences in values, incentives, and relationships between researchers and information specialists. Cooperation is needed between researchers, funders, and institutions to address challenges around data curation, management, and sustainability.