The use of social media is exploding in Brazil. It's the third largest market for Facebook; fifth largest for Twitter. The controversial women-only app Lulu recently launched here and quickly became the top downloaded app in the country, making Brazil Lulu's biggest market. "I think it is cool because it's a social network for what all women throughout history have always done," says 20-year-old Marcela, as she taps away at the Lulu app on her iPhone.