Publisher networks where we distribute and display our advertisements to promote our Sites and search services (such as facebook and Google), and service providers who help us optimize our advertising campaigns (such as retargeting companies). These third parties collect information about you in order to provide their ad campaign optimization services to us, and may also use such information to develop their own ad targeting algorithms and help other advertisers with optimizing their own campaigns by targeting ads to you based on your activities on our Sites. <p> They may also combine information about your activities on our Sites with information about you from other sources not affiliated with us. </p>