You are getting me totally wrong. You can make bank with viral websites, even I have one generating a good income for me, but by spending $100 and getting an instant 130% ROI is far-fetched. Look at his AD settings, the target is broader than Atlantic ocean. He just selects US and triggers the age limit to 25-65+, that's it? Is it that easy to get a fascinating ROI with Facebook Advertisement? No, it certainly is not.
I promote CPA websites, and with $700-$1,000 expenditure in FB Advertising, I end up with $7,500-$9,000 a month, that's because I promote something that gives $15+ per lead, and adsense will not give you more than $0.8-$1.00/click, at least not for these viral site ads, and also given that I target only active audience for my niche, not just random broad audience.
Fair enough.
Like the guy I mentioned in my post, he paid $1k in advertising fees on FB. This was all in one month. He also used adsense to monetize his site and he spent far less than the OP. Pretty sure his target audience was broad as well (at least 1million+ demo) I don't think FB charges you when someone shares your post. So when your ad gets shared several times by thousands of different ppl, you're literally getting free advertisement from FB.