Techniques are provided relating to advertising campaign optimization. Information is obtained relating to online and offline behavior of a set of individuals in association with a brand associated an advertising campaign. Based at least in part on the information, one or more metrics are determined reflecting an association between online advertising and offline behavior relating to the brand, or vice versa. Optimization is performed for at least one parameter of an online advertising campaign or an offline advertising campaign based at least in part on at least one of the one or more metrics. The campaign could also be a combined offline/online campaign.