Website "flash sales" are fueling lightning-fast growth for online retailer Zulily, and central Ohio has been one of the biggest beneficiaries. Zulily was founded in 2010 in Seattle and sells apparel, decor items and other merchandise via short-term "events." Sales are growing at warp speed, going from nothing several years ago to a projected $1.2 billion this year. As a result of the spectacular growth, Zulily has been adding employees at a fast clip. In Columbus, a market it quietly entered in 2012 with a distribution center in Obetz, the company has grown to 1,110 employees.