Congrats to your success of your app!
BY THE WAY, I'm very interested to your success story.
I'm also an individual developer and I tried FB but the result was bad. The hit rate is only 0.5% which wastes me a lot of money.
Could you please share your experience e.g. where to find the youtube prankster, how to get FB ads to be success, do you try any paid per install web sites, do you try any review exchange web sites, etc?
thanks in advance and hope you will be more success on app business.