Cache's use of mobile push notifications typifies how the marketing tactic came of age in 2012, writes Christopher Heine. Cache establishes user preferences on frequency when consumers download the application, and it employs location-based push notifications of promotions when shoppers are in proximity to one of Cache's 262 retail stores. "It no longer feels like an invasion. It's feeling more like an invitation. It's signaling a greater degree of personalization in the app experience," says Usablenet Chief Marketing Officer Carin van Vuuren, adding that half of the company's app launches in 2012 have included push.