TechTV is a defunct 24-hour cable and satellite channel based in San Francisco featuring news and shows about computers, technology, and the Internet. In 2004, it merged with the G4 gaming channel which ultimately dissolved TechTV programming. At the height of its six-year run, TechTV was broadcast in 70 countries, reached 43 million households, and claimed 1.9 million unique visitors monthly to its website. A focus on personality-driven product reviews and technical support made it a cultural hub for technology information worldwide, still existing today online through its former hosts' webcasts, most notably the TWiT Network. The offices were located at 650 Townsend Street, 94103, and the studios, of which there were two, were located at 535 York Street, 94110. Names Originally the channel was called ZDTV by its founder, Ziff-Davis, when it debuted on May 11, 1998. It later was owned by Paul Allen's Vulcan Ventures. Vulcan Ventures sold TechTV to G4 Media (owned primarily by Comcast), which merged it with the video game channel G4 in May 2004 to form G4techTV. In February 2005, the name was changed back to G4, eliminating TechTV from the name completely. Show personalities The personalities of TechTV include Leo Laporte, Kate Botello, Roger Chang, Yoshi DeHerrera, John C. Dvorak, Carmine Gallo, Ali Hossaini, James Kim, Kris Kosach, Pam Krueger, Chris Leary, Chi-Lan Lieu, Jim Louderback, Tom Merritt, Megan Morrone, Patrick Norton, SuChin Pak, Michaela Pereira, Bill Rafferty, Kevin Rose, Martin Sargent, Catherine Schwartz, Adam Sessler, Laura Swisher, Morgan Webb, Tammy Cavadias and Liam Mayclem. Many former hosts of TechTV programs have gone on to create new programs distributed online: Leo Laporte's This Week in Tech, Chris Pirillo's live.pirillo.com, Systm, thebroken, From The Shadows, commandN, Diggnation, Infected with Martin Sargent, DL.TV, CrankyGeeks, InDigital, East Meets West, and Weezy and the Swish are some of the shows produced by alumni. Leo Laporte hosted Call for Help which aired until April 6, 2007. It was revamped and renamed The Lab with Leo Laporte and was shown on G4techTV Canada and the Australian HOW TO Channel. The show was filmed in HD and Laporte hoped to have it picked up by an American network. The series has since been cancelled due to poor ratings. Kevin Rose, who worked on "The Screen Savers" and "Unscrewed with Martin Sargent", co-founded Digg which he featured on "The Screen Savers" in 2004 , was hired by Google in March 2012,