This paper aims to provide an understanding of the suitability of environmental disclosure practices on social media with the one on corporate sustainability reports based on the concept of narcissistic accounting. This study applied quantitative methods using the Wilcoxon and Mann-Whitney tests to evaluate the hypothesis. The findings of the study indicate that the environmental disclosure of companies in Indonesia through Instagram is still in its early stages. The environmental disclosure in corporates' sustainability reports with narcissistic and non-narcissistic leaders are different while the environmental disclosure on social media for companies with narcissistic and non-narcissistic leaders are not different. This study provides practical implications for stakeholders, especially for the public who use CSR data, regarding environmental disclosure for various interests and decision making, in addition to providing insight for management in the realm of strategic management to disclose CSR activities, especially environmental disclosure on social media. This study is also beneficial from a scientific point of view regarding the disclosure of the corporate environment associated with the concept of narcissistic accounting.