AFP writes:

<<Iran has blocked access to more than five million Internet sites, whose content is mostly perceived as immoral and anti-social, a judiciary official was quoted as saying on Wednesday. (...)

In recent years, Internet service providers have been told to block access to political, human rights and women's sites and weblogs expressing dissent or deemed to be pornographic and anti-Islamic.

The ban has also targeted such popular social networking sites as Facebook and YouTube, as well as news sites.>>
http://tech.yahoo.com/news/afp/20081119/tc_afp/iranpoliticsmediainternet

[Thanks Bilal http://startupmeme.com/iran-blocks-facebook-youtube-and-5-million-other-websites/]