The usage of SNS (Social Networking sites) has been increased and universalized across the world. People value sharing information and communicating with each other through SNS. At the same time, strangers can easily collect one’s personal information through SNS. Although a lot of SNS users concern about their privacies, some people have witnessed that their personal information has been distributed over SNS without their permissions. Any of SNS users can be a potential victim of a privacy intrusion. Simultaneously, any of them can be a potential intruder of someone’s personal information on SNS. This study focuses on intruders of SNS privacy. There are two types of intruders: a benign intruder who simply collects one’s personal information and a malicious intruder who distributes that. Through surveying 167 people, it is found that the two types of SNS privacy intruders (collector and distributors) were affected by different factors. For the intention to collect someone’s private information, curiosity, response cost, and self-efficacy affect. For the intention to distribute someone’s private information, the past experience of intruding others’ privacies, enjoyment, and low ethical consciousness affect. There is also a relationship between the intentions of collecting and distributing someone’s personal information on SNS.