Chat" was replaced by Off the Block with Ross and Marissa. Hosted by former Celebrity HouseGuests Marissa Jaret Winokur and Ross Mathews, the show is set to air on Fridays on Facebook following the live eviction. Spin-offs There have been two spin-off editions of Big Brother. In October 2016, CBS premiered a spin-off web series, Big Brother: Over the Top, as an original series for CBS All Access. Unlike the flagship, television version, it was broadcast exclusively online with a shorter, 10-week season. The second spin-off, Celebrity Big Brother, aired its first season on CBS on February 7, 2018. Celebrity Big Brother was renewed for a second season, which premiered on January 21, 2019 and concluded on February 13. However, on January 1, 2020, CBS announced there would not be a Celebrity Big Brother in 2020. In September 2021, CBS announced that the celebrity edition of the show would be returning on February 2, 2022. Though not an actual spin-off, the Canadian edition of the series is, to date, the only series to adopt the full American format of Big Brother. However, other franchises have used elements of the American format, including the 2020 revival of the Big Brother Australia, which uses an altered version of the American format with the Australian public still deciding the eventual winner. Other franchises such as Big Brother Brasil soon adopted individual elements from the American format (Veto Competition, Have/Have-Nots, and Head of Household) into their format while still maintaining the international public vote format for weekly evictions and final vote. Format Big Brother is a reality game show in which a group of contestants, referred to as HouseGuests, live in a custom-built "house" (actually a set built on a CBS stage in Los Angeles, Stage 18 since season six), constantly under video surveillance. While in the house, the contestants are completely isolated from the outside world, meaning that they are not allowed any contact with those not in the house. This rule could be broken, however, in the event of a medical injury, a family emergency or death. The format of the series is mainly seen as a social experiment, and requires HouseGuests to interact with others who may have differing ideals, beliefs, and prejudices. While a competition, the series allows viewers to witness the relationships formed in the house and the behavior of the HouseGuests. Though locked in the house, the HouseGuests