Viral buzz on social network sites about physical activity

Abstract

While there is a growing trend to use social media for public health promotion, research on its actual potential to influence health behaviors is limited. This dissertation explores whether and how social network sites (SNSs) can be used to promote physical activity (PA) through electronic word of mouth (eWOM). Composed of two studies, this dissertation explores PA-related eWOM from both the senders’ and receivers’ perspectives, and examines actual messages. The first study uses a web survey and explores the antecedents and communication consequences of eWOM about leisure-time PA (LTPA), and the behavioral consequences of eWOM among college students. The second study is based on a content analysis of public Twitter posts in the U.S. in 2011 regarding PA. Based on Sun et al.’s (2006) Path Model of Antecedents and Consequences of Online Word of Mouth, it was found that undergraduate SNS users with higher affective involvement and stronger social ties with their SNS contacts were more likely to provide opinions or information about PA. People with stronger social ties were also more likely to seek opinions or information. Both opinion leadership and opinion seeking were associated with forwarding and chatting. Applying the Theory of Planned Behavior, the first study also found social support of PA via eWOM on SNSs is associated with both affective and instrumental attitudes, subjective norms, and perceived behavioral control (PBC), while social negativity of PA via eWOM on SNSs is associated with instrumental attitudes and PBC. Affective attitude, instrumental attitude, and PBC, in turn, predict intention to participate in LTPA. Moreover, when putting all these different constructs together to predict intention, social support via eWOM was found to indirectly influence the intention to participate in LTPA through the constructs in the