Medical workers in Haiti are now trying to spread the message not to use river water without some form of purification.
VOA: special.2010.11.10
"Usually it was a dystopian message in the form of some kind of warning;
VOA: standard.2009.12.19
Space trades at a premium for if a message in the form of electrons has less distance to travel, one player can get their trade instruction in faster than a competitor.
Therefore, instead of trying to develop apps that are really vehicles for your message, which is a surefire way to suppress usage, think of constructing your message delivery in the form of an app, which, if done correctly, should provide real value to users and to your organization and possibly transform your competition into a bunch of angry birds.