‘Boyfriend Tracker’ app raises stir in Brazil

RIO DE JANEIRO • Brazilians were outraged when they learned their country was a top target of the U.S. National Security Agency’s overseas spying operation, with data from billions of calls and emails swept up in Washington’s top secret surveillance program. Yet when it comes to the cloak and dagger effort of catching philandering lovers, all high-tech weapons appear to be fair game — at least to the tens of thousands of Brazilians who downloaded “Boyfriend Tracker” to their smartphones before t...