Using multivariate techniques, social media campaigns can be optimized to increase ROI. Automated tools allow for the creation of targeted audiences at scale and simultaneous A/B testing of ad components across many combinations to find the highest performing variations. Multivariate testing of text, images, locations, interests, ages and gender can produce 3-7x lifts in performance. Retargeting strategies use Facebook ads to follow users across the web who previously visited a site.