Singer. Fashion designer. Entrepreneur. At 27, Francisca Valenzuela has already reached the kind of success usually associated with a professionally managed career. But instead of a top agent or a big record label, the San Francisco-born Chilean artist owes her achievements to a team that includes her mother, biochemist Bernardita Méndez, her boyfriend and artistic confidante Vicente Sanfuentes, and a small, committed staff in Chile that has skillfully used social media—including 275,000 Twitter followers and fans known as “ Franáticos ”—to spread the word of her talents.