In this study, we theorize that the way consumers communicate on social media (“liking”2 vs. posting) leads to consequential preferences for luxury products. Specifically, for light users, who spend less than one hour on social media, “liking” (vs. posting) strengthens (vs. weakens) preference for social value-framed luxury products (i.e., creates a good impression to others) compared to functional value-framed products (i.e., superior quality). This contrasts with heavy users, who spend more than two hours on social media, where posting (vs. “liking”) strengthens (vs. weakens) preference for social value-framed luxury products compared to functional value-framed products. Thus, the relationship between social media interaction (“liking” vs. posting) and preference for luxury products is conditionally mediated by communication expectation with others. Both the direct effect and indirect effect are moderated by the time spent on social media and luxury value type.