Technorati is an Internet search engine for searching blogs. By June 2008, Technorati was indexing 112.8 million blogs and over 250 million pieces of tagged social media. The name Technorati is a blend of the words technology and literati, which invokes the notion of technological intelligence or intellectualism.Technorati was founded by Dave Sifry, with its headquarters in San Francisco, California, USA. Tantek Çelik was the site's Chief Technologist.Technorati uses and contributes to open source software. Technorati has an active software developer community, many of them from open-source culture.