タイトル別名 Network Analysis of an Emergent Massively Collaborative Creation on Video Sharing Website Case Study of Creation Community of Hatsume Miku Movie on Nico Nico Douga Case Study of Creation Community of Hatsume Miku Movie on Nico Nico Douga ニコニコ動画における初音ミク動画コミュニティを対象として The Web technology enables numerous people to collaborate in creation. We designate it as massively collaborative creation via