LOS ANGELES (Reuters) – Billionaire Sean Parker, co-founder of music-sharing website Napster and the first president of Facebook, was married on Saturday in Northern California, a representative for the couple said. Parker, 33, married his fiancee Alexandra Lenas in a ceremony at an inn in the costal retreat of Big Sur with 300 family and friends in attendance, his representative Matthew Hiltzik said in a statement. Their daughter, Winter, who was born this year, was part of the ceremony. Parker's fortune is estimated at $2 billion at Forbes.com. …