The Internet for the first time entirely made possible the fulfillment of the Article 19 of the Universal Declaration – “Everyone has the right to freedom of opinion and expression; this right includes freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers.” On the Internet, everybody is, even unconsciously, sending or receiving information, sharing idea and changing views. However, at the same time it has again showed how diverse the world is and how cultural, political, religious and social differences make the universal dimension of freedom of expression difficult. The dissertation will show how complicated the issue of this freedom on the Internet is within existing mechanisms, national or international, state or self-regulatory. It aim to conclusion that ambiguous interpretation of freedom of expression and of the roles of key actors could only lead to further that it is necessary limitation of this invaluable virtue of democracy. Thus there is a need for better cooperation between namely the governments and other stakeholders, particularly Internet service providers. Fight for freedom of expression should never stop, as the moment we stop thinking of it, it may vanish without being noticed.