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This study investigates factors that motivate users of social network sites (SNS) to write responses to support-seeking posts on SNS. In particular, support-seeking message valence and support providers’ efficacy perceptions were examined. An online experiment with 209 participants revealed that participants reported lower support provision efficacy and impression management efficacy when responding to a negative post than a positive post. Message valence and efficacy perceptions impacted word count and emotion words in their responses. Theoretical and pragmatic implications for supportive communication and computer-mediated communication were discussed.