abcnewsradio: From @KHeussner and @ABC News The micro-blogging site Twitter is hardly micro anymore. Since its launch five years ago today, thesocial media start-up has shown the world just how powerful 140 characters can be. It has taken down governments, whilelifting Hollywood stars to new heights. It has brought accountability to institutions, while giving individuals a new platform for action. Over the past five years, single tweets have led to marriage and divorce, fame and notoriety, revolution and rebuilding — here are 10 of our favorites… Keep Reading on ABC News Follow @abcnewsradio on Twitter