Will click-click replace ding-dong? The world is changing and Avon is staying ahead of the curve. Avon’s Mark brand is headed to Facebook. The move is a testament to the changing habits of 40,000 to 50,000 Mark representatives, who range from 18 to 30 years old. At a recent meeting with analysts, Avon — a more than $10 billion company — declared it planned to commit $50 million over the next several years to its social networking strategy, recalled Caris & Co. analyst Linda Bolton ...