Arianna Huffington, co-founder and editor-in-chief of The Huffington Post, interviewed Facebook Chief Operating Officer Sheryl Sandberg at a Huffington Post Advertising Week event in New York.Sandberg answered questions from Huffington and the audience regarding Facebook's mobile plans, the company's stance on privacy, Facebook CEO Mark Zuckerberg's $100 million donation to improve Newark schools, and the movie "The Social Network," which presents an unofficial account of Facebook's early days.Sandberg offered a glimpse into her life at Facebook (where no one has offices, she noted, and most employees sit next to each other at desks), as well as her close collaboration with Zuckerberg, whom she sits next to at the Facebook offices.