It took 15 years for the world to reach 700 million smartphone users by 2011, but by the end of 2012, there were 1 billion. A technology that was initially slow to catch on has exploded, and it is predicted that it will continue to explode, adding another billion users by 2015 according to a study by Strategy Analytics. It is for this reason that businesses of all size and industry are rushing to formulate a marketing strategy targeting smartphone users. It’s unavoidable. The 1 billion smartphone users in 2012 should be reason enough, but here are a few more.