TMZ.com is a celebrity news web site which debuted on November 8, 2005. It was a collaboration between America Online (AOL) and Telepictures Productions, a division of Warner Bros.,until Time Warner divested AOL in 2009. The site is now under the sole control of Warner Bros. The letters TMZ stand for thirty-mile zone, referring to the "studio zone" within a thirty-mile (48.3 km) radius of the intersection of West Beverly Boulevard and North La Cienega Boulevard in Los Angeles.Shooting within this zone is considered local. Locations outside this zone are subject to mileage and travel time charges by the talent and crew.

Source: Wikipedia.org