Interesting for two reasons: 1) as the article notes, it's great to see Luxury brands adopting online marketing strategies and tapping the potential of social influence marketing; and 2) here's a great way for a brand marketer to begin to quantify the impact of digital in terms of driving foot traffic to the makeup counter. It's a challenge many online marketers are wrestling with, looking to things like mobile couponing and other promotions to get at cross-channel measurement. This will be a big focus in 2010.