There is a massive revolution in technology my friend, and mark you it's not always necessary for a start-up to make fireworks globally, homegrown solutions consumed locally is what matters, it'd be a mistake to attempt to compete against Whatsapp at global arena.
You must take some lessons on how to implement a successful start-up 101, you don't go against the already established global giants, but swim with them, if possible compliments their systems. For instance, I've built corporate system that integrates with API from G Suite with their range of products such as Gmail, Docs, Drive, Calendar etc, same system integrates with Facebook and other solutions and has seen success in its use.
Take your time to read Kenyan statistics on ICT annual growth, ICT contribution to GDP and so on, numbers don't lie....