Parler was marketed as the free speech alternative to popular social media. The social media site was launched in 2018 with an interface similar to Twitter’s, and gained users rapidly after the 2020 presidential election. After the January 6, 2021, attack on the U.S. Capitol, it was removed from the Apple and Google app stores, and dropped by its server host, Amazon, based on its alleged use by people involved in the insurrection. Parler is a Casebook value under the "Network Terrain" variable in the code book.