http://jp.techcrunch.com/archives/20130208everyone-stop-dm-ing-on-twitter-and-start-using-the-moped-app-now-its-way-better/

http://booklog.kinokuniya.co.jp/ito/archives/2013/01/post_90.html

http://www.47news.jp/CN/201302/CN2013021301000776.html

http://gigazine.net/news/20130206-pigeon-post/

http://www.tokyo-np.co.jp/article/national/news/CK2013021202000055.html

http://headlines.yahoo.co.jp/hl?a=20130212-00000981-yom-soci

http://sankei.jp.msn.com/affairs/news/130212/trl13021221000003-n1.htm