Sheryl Sandberg on Facebook's business modelAt a conference for magazine publishers, Facebook COO Sheryl Sandberg all but admitted her company still has no idea how it's going to make money, besides letting Microsoft broker ads for it. "We need to find a new model and new metrics," she told attendees at the American Magazine Conference. It's a classic move from the White House veteran's political background: If you're not winning by existing rules, move the goalposts. (Photo by Doug Goodman/AdAge)