By Alexandra Bruell Bacardi last October ran a test to tell whether its campaign promoting Bombay Sapphire in the U.K. could boost sales and brand favor -- and in the process help answer a broader question about the long-term fate of its digital marketing as the way consumers are targeted for ads faces a shift. The campaign took 10,000 anonymized identities of people who had visited the gin brand's distillery or website, and sent them offers like promotional emails or Instagram ads promising drink recipes and early access to new products. The result was a click-through rate, which indicates how often ad exposures lead to clicks, around 9% higher than previous campaigns that relied on common but now endangered targeting methods, such as using data from third-party sources. The new campaign also saw a 14% increase in cost efficiency as measured by a cost-per-click metric.