Companies that offer free services, like Facebook and Twitter, are for-profit companies. So where is the profit if the service is free?  It could be in an 'upsell' product, like LinkedIn, which means that some useful features are not available in the free version of the product and require a subscription fee to access. Another common profit model is to collect and sell your data, which is one of the ways Facebook makes money. My guest to discuss this issue, and many more, is Dan Lohrmann, Chief Security Officer (CSO) and Chief Strategist for Security Mentor Inc. and an internationally recognized cybersecurity leader, technologist, keynote speaker and author. He has more than 30 years of experience in the computer industry, beginning his career with the National Security Agency.