Social media service has surpassing information sites, shopping sites and became the top online activity for Taiwan people. But using social media can lead to privacy or security issues, thus social media providers should protect user's account security. However, users may not be familiar with security settings, or lacking willingness of using them. In this article, we will use the most popular social media service, Facebook, to discuss average users' awareness and willingness of using security settings, further providing suggestions on using security settings.