Indonesia underwent Reforms in 1998 which shifted the social and political situation towards a more democratic direction when the authoritarian New Order regime collapsed. Indonesia as a multicultural society consists of diverse tribes and religions. There are five religions that are nationally recognized namely Islam, Catholicism, Christianity, Hinduism, Buddhism, and Khong Hu Cu. Moslems as the majority are often deemed as the key to developing a respectful religious life among Indonesian people. However, after the reformation many Islamic organizations with various sects each carrying their respective ideologies arose. The ideology adopted by Islamic organizations in Indonesia extends a wide spectrum from hard-line Islam known as fundamentalist groups to very moderate Islamic groups. This research will reveal the concept of Nusantara Islam which since its emergence has produced polemics and even conflicts between fundamentalist and moderate groups. Based on the theory of social construction of reality, this research sees reality as the result of social interaction between individuals which results in an interpretation of reality so that it is possible to understand it differently (Berger & Luckmann, 2011). The Islamic organization Nadhatul Ulama (NU) which disseminates the concept of Nusantara Islam express their views about Nusantara Islam through various social media they own. This study uses digital ethnography (Cruz & Ardevol, 2013) to understand the topic raised by the NU on 'Islam Nusantara' through social media and its link with the social contexts of the Indonesian people. The research findings reveal that the Nusantara Islam which was constructed as an Islam that is peaceful and respects diversity yet deeply ancient traditional Javanese culture as well. The concept of the Islamic Archipelago is inseparable from the spread of Islam by the Walisongo (nine saints) who fused Islam with local culture without ignoring Islamic values. This then led to differences in views with fundamentalists or groups outside NU. There are also Indonesians who are not too concerned about the existence of Nusantara Islam or Islam that is interconnected with culture through the principle who perceives religion as an individual's private matter.
Keywords ; Islam Nusantara, social media, @nuonline_id