that isnt domain that is a folder or a google tool
think it is a sub domain for quizyourfriends.com. But I am not sure can somebody know ?
I don't think it's a sub-domain. If it were, it would show up in the browser bar as http://www.www01.domain.com .
it just a subdomain, like jwellsy.frihost.com
you can use any subdomain you like when you have control on your domain and it's dns.
No, if you use .httpaccess file and block www. for your site. I am not sure how to do it, but when I was register host and domain, responsible man ask me do I like www or http without www, or I like open my site with both possibilities.