Micro-blogging site Twitter last night [26 Jan] announced it would begin withholding tweets in certain countries, sparking claims of censorship. Prior to this move, Twitter had to remove a Tweet from its global network if it received a government takedown request from a government, but it will now be able to restrict content in a specific country while keeping it available in others. In the interests of transparency, Twitter has also expanded its partnership with the Chilling Effects website, making it easier to find Twitter takedown notices.