Nokia, Skype and their industry peers have changed the way the world communicates and has improved the lives of millions of people in the developing world. They continue to change the world with applications like mobile microfinance.
Google has changed the way the world accesses information and has enlightened the minds of millions of people around the world including those of students in the developing world. It continues to change the world with projects like Google Books Library Project
Toyota, Honda and other automobile manufacturers have changed the way the world travels and has transported modern amenities into the lives of millions of people in the developing world. They continue to do so especially in the world of medical services for the poor and displaced like this Mobile Clinic in Rural Rwanda
Next time a company claims that it has changed the world, ask how.