Established in November 2002, BlogCN is the first free blog hosting service provider in China. Based in the eastern city of Hangzhou, BlogCN has built the world's largest Chinese blog community, blog hosting service, and blog search engine.[citation needed] The Internet portal offers free blog space, but began to charge for value-added services, including mobile phone features, in 2005. BlogCN simultaneously introduced a virtual coin system to purchase such services. The total value of BlogCN is estimated at US$10,000,000. 70-80% of its revenue comes from advertising. The website is supported by Web 2.0 software.