The use of online services such as social networking sites or search engines is generally governed by one or more usage policies, such as terms of service, end-user license agreements, and privacy policies. To facilitate effective dissemination of policy information, structured policy data...

The Internet did not create the ad-supported business model. However, a larger variety of ad-supported services have arisen and flourished online because the Internet's functional and economic characteristics have made the ad-supported business model attractive in many online contexts. The...