Twitter has refined its technology so it can censor messages on a country-by-country basis. The additional flexibility is likely to raise fears that Twitter’s commitment to free speech may be weakening.It comes as the short-messaging company expands into new countries in an attempt to broaden its audience and make more money. But Twitter sees the censorship tool as a way to ensure individual messages, or “tweets”, remain available to as many people as possible while it navigates a maze of different laws around the world.Before, when Twitter erased a tweet it disappeared throughout the world. Now, a tweets containing content breaking a law in one country can be taken down there and still be seen elsewhere. Twitter will post a censorship notice whenever a tweet is removed. –ONThis news was published in The Nation newspaper. Read complete newspaper of 28-Jan-2012 here.