And has reached 3.6 million users overnight. That's incredible! I bet the developer is kicking himself for not monetizing with ads right away, that's a lot of traffic and a lot of money.
That's 3.6 million Facebook users in the Breakup Notifier database, not 3.6 million users of Breakup Notifier.
Since the app pulls in all your Facebook friends, and people generally have a few hundred friends, I suspect the number of users of Breakup Notifier is in the tens of thousands.
As appealing as 3.6M users sounds, "reach" apps like this often make really bad money. He would've made no more than $500 if he was doing well. He was capturing emails, so that had long term potential, but he wouldn't have become rich from three days of FB user impressions.
it was only a weekend project, only running for a few days before takedown - under those circumstances I'd call $500 a solid outcome, especially when the alternative is $0.
As someone with little experience with monetization, which ad networks do you usually use on a site with - at the time - no traction? Yoggrt, Fusion Ads and Deck Network come to mind, but you can't use nor apply for them, so what does that leave you?
Sites like The Deck aren't really ad networks, they're more like vanity projects for hipster web designers. AdSense would not work well either with no text content.
However CPM banners like Doubleclick combined with affiliate links to dating sites could do very well indeed.