I am searching for an extension for blogging. What I want is something like joomla.com with sobdomains for each blog, like myblog.joomla.com . I found easyblog  , but it doesn't give for each blog a sobdomain. Is there any blogging extension?

I am searching for an extension for blogging. What I want is something like joomla.org with subdomains for each blog, like myblog.joomla.com . I found easyblog, but it doesn't give for each blog a subdomain. Is there any blogging extension?