What is Freedom of Speech?

According to the Universal Declaration of Human Rights, “Everyone has the freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers”. This is the “officially accepted” definition of freedom of speech. Nevertheless, it is necessary to mention that the freedom of speech is a notion that has caused many controversyies and a few boundaries need to be drawn accordingly.
Initially, Freedom of Speech is one of the most basic rights of man. Every citizen, may, accordingly, speak, write, and press publish with freedom. It is essential to the exchange of ideas and to the establishment of of an inclusive and transparent government. A glimpse of Chinese history illustrated that almost any enlightened and prosperous dynasty was characterized by a cavalcade of righteous ministers who would speak bluntly to their emperor. Many would even risk their lives to argue with the nobility for the sake of the public good. A good emperor, like Emperor Taizong of Tang, one of the greatest emperors in Chinese history, would allowed his ministers to speak about hearsay without fear exemption of being accused of libel. Thanks to his modesty and open-mindedness ."Reign of Zhenguan"-a golden age was created.
Freedom of speech, however, is not a matter of downright black and white; It is not something mockery - in the disguise of an expression of opinion. It is something said with due respect to the subject of the speech; It is something with many shades of graey. Therefore, certain boundaries must be drawn. On the Monday of January 7, two brothers forced their way into the office of Charlie Hebdo, a French satirical weekly magazine and opened fire, killing twelve. This“deplorable”atrocity, arguably, results from the disturbing illustration emergence of a growing offensive expression synonymous with Islamphobic racistsm. The abuse of the free speech is also evident ion the Internet whose which unique characteristics allows users to present themselves anonymously, through the use of pseudonyms and avatars. Consequently, the Internet may be used for cyberbullying through inflammatory languages messages.
Freedom of speech truly is a basic human right but it also assumes a level of responsibility on the part of those who exercise these freedoms, in the form of as an invisible social contract. As John Stuart Mill put in On Liberty “The only purpose for which power can be rightfully exercised over any member of a civilized community is to prevent harm to others".

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You write very well, have an excellent vocabulary and your writing has a good flow to it. I have removed some words which are not necessary. As a general rule, less words and more simplicity is better.