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Luca Mars did the math. Three years ago, the 19-year-old accounting student, who lives in the small Brazilian city of Várzea Alegre, 2,200 miles northeast of Rio, took a look at his mobile phone bill and knew that he couldn’t cover the cost of the data plan. Mars works as an administrative assistant at a primary school, and says his phone bill typically ate up 10 to 15 percent of his paycheck.More →

You see your girlfriend chatting with an attractive guy you don’t know. As you near, he scurries away. You get suspicious. Would you have felt better if he had stuck around till you arrived?

Now consider this: Are you more likely to fly into a jealous rage if your significant other has Facebook contact with an attractive person you don’t know or if he or she is doing it on Snapchat?More →