This paper aims to investigate tourist destination choice, focusing on the research question how and to what extent the destination images of tourists' social network members influence their choice behavior. To this end, data were collected using a sequential stated adaptation choice experiment, in which respondents were requested to choose a tourist destination from a single choice set twice, once before and once after being informed about the destination image of social network members. A discrete choice model was estimated to investigate tourists’ choices. The estimation results revealed that the destination image of social network members allow tourists to update their existing knowledge toward destinations, through which their choice behavior is influenced. Tourists tend to adopt their destination image of social network members no matter whether they have a prior image or not. The magnitude of this social influence depends on the properties of the social networks.