TOKYO, TOKYO - APRIL 29:  Participants, including families with young children, take part in a 'Twit No Nukes' demonstration march through Shibuya district protesting against Japan's nuclear energy policies and the radiation contamination from the March 2011 Fukushima Daiichi disaster, on April 29, 2012 in Tokyo, Japan. 'Twit No Nukes' demonstrations are primarily made up of citizens who have not joined demonstrations or protests previously, and the group gains it's name from the fact that it is organised via Twitter social media networking.  (Photo by Jeremy Sutton-Hibbert/Getty Images)