The Islamic Republic of Iran continues to expand and consolidate its technical filtering system, which is among the most extensive in the world. A centralized system for Internet filtering has been implemented that augments the filtering conducted at the Internet service provider (ISP) level. Iran now employs domestically produced technology for identifying and blocking objectionable Web sites, reducing its reliance on Western filtering technologies… Iranian.com, roozonline.com, and radiozamaneh.com are among the independent sources of news and opinion that are blocked in Iran. The popular Farsi social networking and independent news Web site, Balatarin.com, was blocked in 2007, reportedly for a user-contributed post with a link to a Web site that included a rumor of the death of Supreme Leader Ali Hoseyni Khamenei. Strident objections by users to the blocking of Balatarin were not successful in reversing the blocking decision, and Balatarin continues to be blocked.