Using a German online panel, we investigate respondents’ propensity to consent to the linkage of publicly available Facebook data to their survey data and to enable linkage. We analyse the effects of three experimental variations on consent and linkage among Facebook users: (1) the consent question wording, (2) the position of the Facebook consent question in a series of consent questions, and (3) the incentive offered. To describe potential selection bias, we consider respondents’ attitudes and sociodemographic characteristics. We found effects of consent question placement on consent and linkage and effects of higher incentives on linkage, but we found no effects of question wording. Our analysis also showed that linkage was dependent on privacy and data security concerns, trust in the data-collecting actor, respondents’ attitudes toward surveys, and several sociodemographic characteristics.