This study examines how CEOs engagement on social media (i.e., LinkedIn) affects investors assessment of firm risks. We argue that CEOs use social media as a more personal and direct form of disclosure mechanism that is likely to influence investors perception on the riskiness of the firm (i.e., stock price volatility) differently from traditional firm disclosures. Using a sample of CEOs who have LinkedIn profiles in 2023, we find that firms with CEOs who have strong influence on LinkedIn (i.e., high numbers of followers; influential CEOs) are associated with higher stock price volatility than those with inactive LinkedIn CEOs. More specifically, the stock price volatility of firms with influential CEOs rises in firm-specific risks and is not associated with systematic risk supporting that investors seem to question the credibility of the information disclosed on CEO LinkedIn profiles and perceive these CEOs as risk-takers. Further tests also reveal that the credibility issue of social media CEOs can be mitigated by third-party validation as we find that firms with CEOs that received LinkedIn Top Voice certification are not associated with increased firm-specific risks. The findings from this study suggest that investor perception on the creditability of CEO social media disclosure is crucial in firm valuation and risk assessment.