1. What are we referring to when we talk about a secondary use of data?
2. What is collaborative ?ltering? Who uses it?
3. How are some political campaigns using data mining?
4. Explain the difference between an opt-in policy and an opt-out policy.
5. What about Facebook Beacon made it so unpopular with Facebook users?
6. Give three examples of how data mining is being used on information collected from social networks.