To encourage the voluntary desegregation, districts started developing magnet schools to draw students to specialized schools all across their districts. Each magnet school would have a specialized curriculum that would draw students based on their interests.
Android holds the largest number of installed-base devices, with 1.9 billion in use in 2014, compared with 682 million iOS/Mac OS installed-base devices. Check out the link Android domination to continue in 2014; iPhone loses ground.
WhatsApp has more than 450 million monthly active users. In comparison, Twitter had 241 million users at the end of 2013. Mark Zuckerberg says WhatsApp is on path to reach a billion users.