Sunlight seeps through holes in the roof, illuminating the graffiti-covered walls of an abandoned building where kids created a makeshift dance studio in Rio de Janeiro's Borel shantytown. Beads of sweat form on the young dancers' foreheads, then plop onto a dusty concrete floor as the teens glide and pop, shake and dip in a dance form called "passinho," or "little step." Passinho has been around for years, but it recently began spreading through social media, with dancers posting videos of their moves on YouTube and Facebook, sometimes drawing thousands of followers. The dance is most popular in Brazil's poor favelas, where many credit it with keeping young people out of trouble and away from local gangs. In fact, the dance's popularity has benefited from a police crackdown on another late night activity, more raucous "baile funk" parties often organized by criminal gangs and marred by drug use, violence and incidents of young girls being exploited. The dance's new superstars include Borel slum resident Hilton Santos da Cruz Jr., known as "Hiltinho Fantastico" — Fantastic Little Hilton. Cruz flashes a smile stretching from earring to earring when he talks about going from watching passinho videos online to being crowned a "little step" champion earlier this year on one of Brazil's most popular TV variety shows. During the competition, his rail-thin frame twisted, glided and slid over the floor. "In the past, so many kids were involved in trafficking, or not leaving their house," said Cruz. "Today, passinho is changing everything, helping those on a dangerous path. Me, too."