It's pretty common for people to talk about penny likes, etc. Yes, those may be junk-traffic countries but you get the point. I'm about to start buying FB ads for my apps. Just wondering what a reasonable goal for certain large demographics like teenagers, or frequent flyers, etc? I don't want to drop a few grand on ads on $0.20 per download, when $0.10 is what everyone else is getting, etc. What kind of PPD have you achieved?