Here’s how Google+ and Topshop used everything from microcameras to Hangout apps to create a new kind of fashion show--and mine customer behavior for data that will help shape the retail giant’s buying decisions this season. Last fall Justin Cooke, Topshop’s energetic 31-year-old chief marketing officer, took the high street fashion chain’s social presence to a new level when he collaborated with Facebook on a "Customize The Catwalk" experience during London Fashion Week--over 2 million people watched that show online.