This study uses an online questionnaire survey to investigate Chinese social media users’ acceptance of firm-generated credibility-building posts (FGCPs) on Sina Weibo. The findings show that heuristic cues related to content (i.e., topics regarding competence, benevolence, and integrity) and source (i.e., firm nationality and industry types) along with the moderating role of topic, account, and platform familiarity cues significantly influence users’ acceptance level of such posts. After incorporating the insights gained from participants’ responses to open-ended questions in the questionnaire, this study concludes with practical recommendations for crafting effective FGCPs on social media platforms like Sina Weibo.