Me.dium.com, which has created what it calls a social browser, will have two big challenges to building its business.One is the same as every other social Web company -- building an audience. But given that its business model relies on convincing Internet surfers to share data on every Web site they've visited, it will also need to allay privacy concernsThat kind of comprehensive data capture is what caused an uproar for Facebook when it rolled out its Beacon advertising platform.Medium co-founder David Mandell tells Vator.tv's John Shinal that the company learned from that experience and is giving its users control over who sees their data."When you're using it, you know it's there," in the form of a button that alerts ... [ Read more ]