Nairobi has not stopped growing though, it is only that Lagos grew faster. According to a 2016 startups funding report by DisruptAfrica, Nigeria, South Africa and Kenya attracted the highest percentage, 80.3%, of all funding put into the continent.
Mark Zuckerberg

Pictorial: Mark’s Zuckerberg’s First Day In Kenya; Says Facebook Will Integrate Mobile Money
Other than having lunch with the ICT Cabinet Secretary Joe Mucheru at Mama Oliech Restaurant, he announced that Facebook will integrate mobile money to all activities on the platform