Foursquare acknowledged a grass-roots effort that started in Tampa, Florida [57] in 2010 by declaring April 16 ""Foursquare Day"",[58][59] April being the 4th month and the 16th being equal to four squared.[60][61] Some cities have made official proclamations of April 16 being Foursquare Day (Istanbul, Turkey; Atlanta, Georgia; Austin, Texas; Cincinnati, Ohio; Corpus Christi, Texas; […]