Online Advertising (image) IMDEA Networks Institute Share Print E-Mail Caption The explosion of online advertising is raising serious data privacy concerns. Credit @IMDEA Networks Institute Usage Restrictions This image may only be used with appropriate caption or credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.