According to the blog "Breaking the online dating sound barrier”, the dating site Plenty Of Fish only accepts users from Canada, United Kingdom, United States, Australia, Ireland, New Zealand, Spain, France, Germany and Italy. I did try creating a new user from China and I didn't have any problems (I had the account deleted), so POF must check the IP of the user to see what country it is from before they allow them to register.
The other bit of news about Plenty Of Fish is, it now supports 4 languages. Before now the site was only available in English. As of a few days ago French, German and Spanish versions can be accessed with an Italian version coming soon. This means any text from the user interface (menus, links, etc.) along with all help and information pages are available in the language. The only thing that doesn't get converted is any text a user may have typed for profile fields like the About Me section.