Cyber space and freedom of speech

As you know Internet became dominate communication tools these days ,and definitely, not only it will be used by much more users than now,but also with more innovative application in near future. As a result of Internet attractiveness and accessibility , many people use it for impressing their own ideas in any form,it could be a simple picture ,short video clip ,article ,critic and so on.By the time there is no problem to impress idea ,if there is no violation of other people values. But the Internet is a global platform and when you put your ideas users can access to your ideas around the world,however the issue of censorship in some part of the world maybe denied Internet users access to your ideas if it violated either moral and ethical value or legal and political issues.Now ,an important question must be addressed ;what is the boundaries of freedom of speech on the Internet? The answer couldn't be as short as its question,because there is different religions ,ethics ,legal and political issues in each part of the world,so something could be legal in some part ,while it is considered as a crime in another part .Thus ,freedom of speech on the Internet is an important issue that must be considered for anyone who want to impress own ideas on the Internet.