http://gigazine.net/news/20150429-facebook-revenue/

http://headlines.yahoo.co.jp/hl?a=20150430-00050182-yom-soci

http://news.goo.ne.jp/article/oita/region/oita-50210E7E-F41A-46D9-8207-35672569F343.html

http://headlines.yahoo.co.jp/hl?a=20150430-00000525-san-soci

http://www.asahi.com/articles/ASH4P5JQNH4PPTIL023.html