As the use of Web applications has increased, malicious content and cyber attacks are rapidly increasing in both their frequency and their sophistication. For unwary users and their organizations, social media sites such as Tumblr, Facebook, MySpace, Twitter, and LinkedIn pose a variety of serious security risks and threats. Recent studies show that social media sites are more in use for delivering malware than were previously popular methods of email delivery. Because of this, many organizations are looking for ways to implement effective security policies.