The Best Tweets of Twitter's First Five Years

Five years ago today, Twitter co-founder Jack Dorsey fired off the first tweet signaling the dawn of a new social network. Today the company services 140 million tweets per day and is valued at about $8 billion. Though Dorsey's maiden tweet was rather bland "just setting up my twittr," the micro-blogging service would eventually offer a range of inspiring, funny and moving moments over five