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The role of female managers has been of increasing interest among scholars in recent years, especially regarding sustainability issues. The same could be said about the usefulness of social media in non-governmental organizations (NGOs) in demonstrating accountability to their stakeholders and attracting and keeping donors and volunteers. This paper aims to meet both research interests by analyzing to what extent women in top positions can foster stakeholders' engagement via social media.

Online engagement can be proxied using data from social media to develop a measure that summarizes the main actions social media users are able to use in order to show their reactions to social media publications. Facebook data were obtained using proprietary software (Facebook data model) developed by the research team to carry out data massive extraction, processing and exploration.

The results of the multivariate analysis show that female leadership in both top and environmental-specific positions enhance social media engagement, while a higher percentage of women on the board of directors exert the opposite effect.

This study is not without limitations. First, this research is focused on a specific type of non-governmental organization (environmental NGO). Second, this study does not include economic variables such as donation income or expense structure. Third, data come only from Facebook as the leading social network.

This paper advances in the scarce knowledge about the role of women and the levels of online engagement (interactive conversations) in NGOs focused on sustainability.

Green Public Procurement (GPP) has recently gained attention in the academic and policy arenas since climate change has uncovered the need to be addressed by both private companies and public entities. Because of this growing interest this study aims to explore the most influential journals, publishers, categories, topics and therecent trends and future research lines in GPP.

Based on the Web of Science database, 1,008 articles from 1990 to November 2023 devoted to GPP are analysed by using Bibliometrix, an R-tool to perform bibliometric analysis.

This study introduces the following findings. The most influential journals by far are Journal of Cleaner Production and Sustainability, differing in that the latter is open access (OA) while the former publishes through traditional subscription (TS). This result also occurs regarding the main publishers (Elsevier and MDPI).

GPP is a political commitment that contributes to improving the efficiency of the economies and that has aroused the interest of the scientific community. The paper can provide important insights for GPPs formulation in the areas of procurements and literacy.

The paper leads a debate on the opportunities or threats that the OA journals present for the dissemination of scientific knowledge of GPP, compared to TS publications in the same field.