Several governments around the world are beginning to crack down on their citizens access to the Internet.

The New Scientist Magazine reports that various governments want to squash any opposition groups in their country that use the World Wide Web to send out information.
   
When thousands of protestors took to the streets in Iran last June after a contested presidential election, they coordinated their efforts through the various Internet sites, including Twitter. 

The Iranian government has since tried to stop all access to social networking sites.  Several other countries have also clamped down on citizens access to the social networking site Facebook.