Well it is all about where the traffic comes to your KIK. Or you mass messaging in KIK others? If no - so its some source from which your traffic comes there - like forums, tumblr, IG or others. And its about what you promote in these places.
Anyways KIK is mobile app and for mobile apps the easiest way is app installs and mobile lockers by offering some free Mcdonalds vouchers, its oldschool method, but still works all the time for everyone.