Creating persuasive health messages on social media: Effects of humor and perceived efficacy on health attitudes and intentions.

This study examined how humor (incongruity humor vs. no humor) interacts with individual differences in perceived efficacy to influence health attitudes and behavioral intentions. Results of a controlled experiment ( N  = 294) revealed that among individuals with lower levels of perceived efficacy, incongruity humor, relative to no humor condition, resulted in greater source liking, which in turn, enhanced their attitudes and intentions to perform preventive health behaviors. However, for individuals higher in perceived efficacy, incongruity humor (vs. no humor) had an indirect negative effect on intentions via decreased attitudes. Theoretical and practical implications of these findings are discussed.