This study aims to investigate international communication relationship and global communication landscape in the social media age. Based on social network analysis and the visualization of global media organization network on Twitter， this study examines and visualizes the structure of the global media organization network on Twitter， explores factors that influence the social capital and reciprocal relationship of media organizations， reveals the position of Chinese media organizations in this global network， and provides insights for China's international communication practices in the social media space. The results of this study show that global media organizations form a highly connected network on Twitter. While media organizations from developed countries still hold dominating positions in the network， those from developing countries begin to change their peripheral status in the global communication landscape by strategic social media use. The extent of economic development of the continent and the degree of social media use are positively associated with the social capital of media organizations. The country， an indicator of geographical and cultural proximity can also predict reciprocated vertex pair ratio of these organizations. Chinese media organizations， including the Xinhua News Agency， China Daily and CCTV， have opened English verified accounts on Twitter， indicating China's active motivations and practices to enhance international communication capacity in social media field. The number of Chinese transnational media organization accounts on Twitter ranks the third globally. The social capital of these accounts, however, is relatively low, and these accounts only have reciprocal relationships with media organizations from Asia or Africa. It indicates a huge room of improvement for China's international communication power. In this sense, Chinese media organizations should take the following steps: (1) improve its verified account number and operation on global social media, and increase news reporting about international affairs that employs the reporting style of Western favored journalism professionalism to spread China's voices through international news flow|(2) enhance the close connections with media organizations from Asia and Africa, develop reciprocal relationship with developed countries to strengthen the social capital of Chinese media organizations；(3) independently develop global and international social media platforms, and in doing so, seek advantageous positions in the global digital communication arena.