URLs

• https://www.pixiv.net/users/706445
• https://www.pixiv.net/stacc/math-major
• https://twitter.com/math_008
• https://twitter.com/intent/user?user_id=460961142
• https://sketch.pixiv.net/@math-major
• http://p.twipple.jp/user/math_008
• http://yfrog.com/user/math_008/photos