Common Dreams - Social media website Twitter announced Thursday that it will begin blocking certain messages (tweets) on a country-to-country basis. Twitter has been known as a vehicle for free speech as well as a source for social and political organizing -- notably during the protests in 2011 from the Egyptian uprising to Occupy Wall Street. Governments will now request Twitter to take down certain 'illegal' tweets, which will be blocked from its citizens but may still be visible by users outside of the censored country. Many have now raised concerns that this will open the door for repressive governmental censorship, in some ways defeating the benefits of Twitter all together. Read more.