Keeping in touch with friends and family is tough, really tough. At least for me it is not too far from exercising - you know you should do it more often, but you just don't. That is why Bond exists - it's the app for keeping and maintaining bonds with those you care about.
Think way back to 2002 when Paypal was cool. Now fast forward a decade and think about how Paypal might look if it was still cool and understood mobile? That's Venmo and it is that cool and they definitely understand mobile.