The social media service has organized a set of special hashtags to help followers communicate and search for the latest updates concerning the earthquake. It has also opened up an earthquake section on its Japan mobile site (twtr.jp) that posts links and up-to-date tweets for mobile users. Here's a list of the most popular hashtags:
#Jishin - General earthquake information
#J_j_helpme - Requests for rescue or other aid
#Hinan - Evacuation information
#Anpi - Confirmation of safety of individuals, places, etc.
#311care - Medical information for victims