Billboard introduced another chart called Uncharted, which lists new and developing artists, who are yet to appear on any major Billboard chart, "...regardless of their country of origin." The ranking is based on the views and fans on social networking websites like Myspace and Facebook. It has since been discontinued. In May 2014, after the Korea K-Pop Hot 100 chart was discontinued in the U.S., the Billboard K-Town column continued to provide chart information for K-pop artists on all Billboard charts. The Artist 100 debuted in July 2014. In June 2019, Billboard launched the Top Songwriters Chart and the Top Producers Chart, based on weekly activity on the Hot 100 and other "Hot" genre charts. In October 2021, Billboard launched the Hot Trending Songs charts, utilising real-time music-related trends and conversations on Twitter. See also Official Singles Chart List of record charts Further reading Durkee, Rob. "American Top 40: The Countdown of the Century." Schriner Books, New York City, 1999. Battistini, Pete. "American Top 40 with Casey Kasem The 1970s." Authorhouse.com, January 31, 2005. References External links Billboard popular charts (subscription only except Hot 100, Billboard 200 and Artist 100) Billboard complete artist/chart search (subscription only) Billboard current boxscore (lists one week only) Billboard charts archive (archive of number ones for select charts) Billboard charts