This story was originally published on Marketing Dive. To receive daily news and insights, subscribe to our free daily Marketing Dive newsletter. Dive Brief: American Express is launching an ad network, building off a foundation established by its successful offers business over the past decade-plus, according to a press release shared with Marketing Dive. The announcement was timed to the start of Advertising Week New York. Amex Ads is powered by the payments provider’s first-party data, drawn from a ...