21.   All news media in China are state-controlled, and Internet users must register with the authorities.

22.   Because users must register for the site, advertising can be targeted to user profiles and content selections.

23.   Tonga, a strongly Christian nation, has put a few restrictions on the kind of names it will allow users to register.

24.   In February, China started an Internet crackdown by mandating that all users register with the police.

25.   China, Vietnam, and Singapore all want to restrict the Internet and World Wide Web by using screening software and requiring users to register with government authorities.

26.   There are also a series of country endings, for instance CN for China, that Net users register nationally.

27.   Once users have registered on the site they can leave a message about themselves and look up long-lost classmates.