1. Towards understanding SNS fatigue: exploration of social experience in the Virtual World;Yamakami,2012
2. Facebook: “https://www.facebook.com/”, (Access on May 21, 2015).
3. Twitter: “https://twitter.com/”, (Access on May 21, 2015).
4. Mixi: “https://mixi.jp/”, (Access on May 21, 2015).
5. Google+: “https://plus.google.com/”, (Access on May 21, 2015).