The "Bills Backers" are the official fan organization of the Buffalo Bills. It has over 200 chapters across North America, Europe and Oceania. Also notable is the "Bills Mafia'", a collection of Bills fans organized via Twitter beginning in 2010; the phrase "Bills Mafia" had by 2017 grown to unofficially represent the broad community surrounding and encompassing the team as a whole, and players who join the Bills often speak of joining the Bills Mafia. Outsiders often treat the Bills' fan base in derogatory terms, especially since the 2010s, in part because of negative press coverage of select fans' wilder antics. In 2020, the Bills filed to trademark the "Bills Mafia" name.