Online social networks such as Facebook, Twitter and LinkedIn have experienced exponential growth in recent years. Users are spending more time on Online Social Networking (OSN) sites than on any other sites and services on the Internet. Users post and share a lot of personal information on these sites without being aware of their privacy implications. Personal information posted on these OSNs can be a treasure for marketing companies and cyber criminals. Characterizing the privacy awareness of users is important to design technologies and policy solutions. Users expect the OSN site to provide good privacy protection or provide controls so they can make informed decisions about their privacy.