An Internet search engine for searching blogs, Technorati automatically checks users' sites frequently to find new posts, without anything (except the post itself) needed from the user.
Technorati's categories include: Technology, Business, Entertainment, Lifestyle, Sports, Politics, Videos, Blogging, and Twittorati.
Contributed articles invited, requirements posted on website. A site note: Technorati uses and contributes to open source software. Technorati has an active software developer community, many of them from open-source culture. Sifry is a major open-source advocate, and was a founder of LinuxCare and later of Wi-Fi access point software developer Sputnik. Technorati includes a public developer's wiki, where developers and contributors collaborate, also various open APIs.