Ideas fuel power, giving means, understanding and arguments to the public sphere. Think tanks are the most influential actors in creating and disseminating such ideas in the field of international relations. This article analyses the networks of relations among think tanks in order better to understand their nature and the ways in which they operate in a global reality, organized by geographical areas. The research method is by structural analysis, using raw data collected on Twitter. Most of the think tanks selected are those categorized by the gotothinktank.com study. The main conclusions are that English is the predominant language, that geography still matters in influencing ideas and that us-based think tanks lead the social media conversation.