New York - Time Inc. announced on Monday that it has tapped Web marketing and advertising firm Quigo to develop a custom ad platform for use across Time Inc.'s digital brands, which reach an audience of over 19 million unique users per month. A self-serve Web interface will allow advertisers to purchase text-based, pay-for-performance ads on an individual property like Time.com, or across a collection of Time Inc. sites, which also include CNNMoney.com, People.com, SI.com, InStyle.com and Golf.com. The companies expect the service will generate over $100 million in ad revenue over the next three years.