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Source credibility is a key influencing factor across both commercial and social marketing. It is perhaps even more important for the latter given that the issues under consideration generally have substantial implications for both individual and societal health and well-being. The Act-Belong-Commit campaign is a world-first population-wide application of social marketing in the area of positive mental health promotion. This study aims to focus on the perceived credibility of the Act-Belong-Commit campaign as a source of information about mental health as a predictor of three types of behavioural responses to the campaign: adopting mental health enhancing behaviours; seeking information about mental health and mental health problems; and seeking help for a mental health problem.

A state-wide survey was undertaken of the adult population in an Australian state where the Act-Belong-Commit campaign originated. The survey included measures of the above three behavioural responses to the campaign and measures of respondents’ perceptions of Act-Belong-Commit’s source credibility. Logistic regression analyses were performed to determine whether the three behavioural responses can be predicted based on perceived source credibility. The predictive performance of the model was examined by receiver operating characteristic curve analysis.

Greater perceived source credibility was significantly associated with having done something for their mental health and for having sought information, and an increased likelihood, but not significantly so, of having sought help for a mental health problem.

Despite the acknowledged importance of source credibility, there has been little published research that the authors are aware of that has looked at the impact of such on the effectiveness of social marketing campaigns. To the best of the authors’ knowledge, this is the first published study of the association between source credibility and behavioural response to a social marketing campaign.

Act‐Belong‐Commit is a community‐based positive mental health promotion campaign that targets individuals to engage in activities that enhance their mental health while targeting community organisations that provide such activities to promote their activities under the banner of the Act‐Belong‐Commit message. This paper aims to detail key findings from a population impact evaluation of the campaign conducted in 2010.

Computer‐assisted telephone interviews (CATI) were conducted on a randomly selected adult sample (n=1,113) using quotas to obtain equal representation by age and gender. The questionnaire contained items gauging campaign reach, the impact of the campaign on individual beliefs and behaviours, and perceived societal impact of the campaign on mental illness stigma and openness to mental health issues.

The campaign reached 75 per cent of the population. Amongst those exposed to the campaign, 25 per cent reported changing the way they thought about mental health and mental illness, and 20 per cent reported some behaviour change. The campaign was perceived to be effective in making people more open about mental health issues (77 per cent of reached respondents) and reducing stigma surrounding mental illness (68 per cent of reached respondents).

The campaign provides a framework for increasing mental health literacy on a population scale.

With its focus on the positive aspects of mental health, the paper shows that the campaign is unique in promoting behaviours that people can and should do to build and maintain good mental health, while also encouraging community organisations and groups that provide mentally healthy activities to partner with the campaign to make mental health “everybody's business”.