http://gigazine.net/news/20131106-sensortower-app-seo/

http://diamond.jp/articles/-/44119

http://www.47news.jp/CN/201311/CN2013110401001663.html

http://headlines.yahoo.co.jp/hl?a=20131107-00000560-san-soci

http://www.hosokai.or.jp/item/annai/shinkan/shinkan.html

http://www3.nhk.or.jp/news/html/20131107/k10015860471000.html

http://www.yomiuri.co.jp/national/news/20131107-OYT1T01105.htm?from=ylist