The internet usage among the public, has also improved the usage of official websites as a means of media disclosure for the social responsibility held by corporations. One of the purposes of this study is to describe the nature of messages content in corporate social responsibility (CSR) communication published on official websites of companies in telecommunications in Indonesia. Involved in the case study chosen are the Indosat Ooredo <indosatooredoo.com> and Telkomsel <telkomsel.com>. Also, this study is conducted to analyze the level of interactivity of Indonesian telecommunication companies' websites. In this research, the content analysis method is used. Content analysis is employed to describe in detail a particular message or text. The result obtained showed that the two telecommunications companies studied have considered that CSR information is vital, as shown at the dedicated page made for CSR communication in the website. However, the interactivity level in each website is in medium level. They used social media such as YouTube, Instagram, Facebook and Twitter to build two ways of communication with the stakeholders.