The increase for Internet corporate social responsibility (ICSR) creates new challenges to investors, management, and regulators as there is no guidance. Prior studies have found significant relationship between firm characteristics and corporate governance mechanisms and papers based for corporate social responsibly disclosure. Additionally prior studies have also found there is not significant relationship between firm characteristics and corporate governance mechanisms and Internet reporting. There is gap between these studies. The study use online research and content analysis of Internet corporate social responsibility disclosure for a sample of 100 large public listed companies in Malaysia. Agency and signalling theories as well as disclosure literature were used to generate hypotheses regarding the determinants of ICSR disclosure. However, the result of the current study can’t find that firm characteristics and corporate governance mechanisms are related to ICSR. We propose legitimacy theory (environmental pressures including political, social and economic) as a potential alternative explanation for ICSR disclosure.