The document discusses why mobile apps are not as viral as other technologies. It provides three main reasons: 1) Many people do not have data plans, are on different carriers, or do not own smartphones, which limits the spread of apps. 2) The reproduction rate of apps is much lower than for pandemics or social networks due to infrastructure barriers. 3) While things like Facebook and influenza spread very quickly, mobile apps face adoption barriers and are not yet spreading as virally as other technologies.