Second Love in Argentina.
Second Love is not a social network, it is a casual online dating site.
Surely many Argentineans created a profile there because they are very curious, but my bet is: They are not going to pay any dollar for casual contacts.
Second Love is in its euphoria phase, initial effervescence, that in less than 3 months everything collapses.
Second Love is not as popular as the original article says. You can check the traffic rank, bounce and the time spent by its users with Alexa.
The cheaters do not want to use sites to infidels, they do not want to know other cheaters like them.