article "Investigating online dating fraud"

http://www.net-security.org/secworld.php?id=17922

"The highest percentage of fraudulent transactions on online dating sites in 2014 originated from these countries:

    Nigeria: 29 percent
    Ghana: 26 percent
    Ivory Coast: 15 percent
    Vietnam: 10 percent
    Argentina: 8 percent."

The biggest scammers are not from Ghana or Nigeria. They are precisely marketing executives from big sites. They use credit card billing trickery.
Lack Of Innovation & Decadence can summarize the Online Dating Industry for years.
http://onlinedatingsoundbarrier.blogspot.com.ar/2015/01/what-i-learned-at-idate-2015.html

Please remember:
Match in USA
http://www.nydailynews.com/news/national/photos-posted-match-led-suicide-model-article-1.1527230 

Evan Spencer, had said that despite the fact that anti-scammer technology is available, Match fail to use such things as face-recognition software – which would have discovered that her pictures were being used hundreds of times.
http://onlinedatingsoundbarrier.blogspot.com.ar/2014/11/bad-news-big-lawsuit-against-match.html
Last August 2011 when a U.S. Class Action Called Match a 'Scam' / More than 90% of potential dates are "phantoms," suit charged then Match had morphed its marketing campaign.