If you grew up without the Internet, sharing your location might seem weird. Using an app that looks like a Warhol painting might seem weird. But if you grow up never knowing a time before YouTube, you might find yourself with different preferences.
Small groups are the new social networks. The next counter-cycle to the giant island of Facebook and Twitter will be an archipelago of different groups, one for each niche and community.
What’s a messaging experience that’s even more engaging than WhatsApp? An obvious improvement would be speed. WhatsApp is pretty responsive, but maybe you can make it even faster. What else?