Facebook marketing</strong> : We may use your email address and Facebook ID to participate in Facebook’s Custom Audience and Lookalike Audience programs, which enable us to display campaign promotions to both existing and prospective members when they visit. To do this, we first send a digital fingerprint of your data to Facebook -- not your actual personal information -- and they check if it matches a fingerprint of their data. If you’re a match, Avaaz campaign promotions may then appear when you access Facebook.