The television industry developed in Manhattan and is a significant employer in the borough's economy. The four major American broadcast networks, ABC, CBS, NBC, and Fox, as well as Univision, are all headquartered in Manhattan, as are many cable channels, including CNN, MSNBC, MTV, Fox News, HBO, and Comedy Central. In 1971, WLIB became New York City's first Black-owned radio station and began broadcasts geared toward the African-American community in 1949. WQHT, also known as "Hot 97", claims to be the premier hip-hop station in the United States. WNYC, comprising an AM and FM signal, has the largest public radio audience in the nation and is the most-listened to commercial or non-commercial radio station in Manhattan. WBAI, with news and information programming, is one of the few socialist radio stations operating in the United States.