 For example, Topcoder is using a modified version based on normal distribution, while Codeforces is using another version based on logistic distribution.Elo rating system has also been noted in dating apps, such as in the matchmaking app Tinder, which uses a variant of the Elo rating system.The Elo rating system was featured prominently in "The Social Network" during the algorithm scene where Mark Zuckerberg released Facemash.