Abstract
As social technologies increase in popularity, there is a growing interest in incorporating them into mental health interventions. Research shows that the use of social technologies may support belonging and mental health. Findings, however, are contradictory and highlight the need to clarify the processes and mechanisms by which this technology may have positive effects. This study conducted a realist evaluation of a web‐based citizen‐to‐citizen platform adopted within community care in a Danish Municipality. It focused on how, for whom and under what circumstances the web‐based platform worked to promote belonging and mental health. The evaluation was structured in subsequent phases of development, testing, and refinement of programme theories. A purposeful sampling frame was developed based on the programme theories, and 27 interviews were conducted. With variations, the platform was found to support its users in meeting their social needs by (a) expanding their access to social networks; (b) allowing them to overcome barriers related to reaching out to new people in real life and (c) providing them with an improved starting point for identification of a relational match. Whether this resulted in improved belongingness and mental health was strongly affected by individual and relational circumstances. Findings suggest that web‐based platforms that aim to enable citizens to locate friends and activity partners can serve as helpful tools in interventions striving to promote mental health in the community, as they may support people to fulfil a need for belongingness. However, the impact of such tools is highly dependent on the individual’s abilities to use the initiatives to form relationships of sufficient quality to accommodate these needs. People with previous relational difficulties, and who have struggled to achieve feelings of belonging and citizens with limited digital literacy, may need support to realise the social opportunities provided by these technologies.