https://medium.com/hacking-and-gonzo/how-reddit-ranking-algorithms-work-ef111e33d0d9
https://help.imdb.com/article/imdb/track-movies-tv/faq-for-imdb-votes/G67Y87TFYYP6TWAV
https://community.topcoder.com/longcontest/?module=Static&d1=support&d2=ratings