インスタ アルゴリズム Poll of the Day
http://gregorycnmb182.theglensecret.com/a-trip-back-in-time-how-people-talked-about-insuta-ren-qi-tou-gao-20-years-ago
Besides, it is found out there are also some registrar companies who require a notarized kind or other formal recognition documents, but they're just based on the selected county which the registrants resides in.