Facebook users in their thousands have signed a petition to protest against Facebook’s new ad network Beacon. The system automatically tracks what users are buying on affiliated sites and displays the information on Facebook home pages. However, users are worried that Beacon is an opt-out not opt-in service.

Forrester analyst Charlene Li has even deeper worries, as she points out in this post. The cookie-based approach means activity on one PC can be ascribed to an individual wrongly – and that could be quite damaging, she argues.

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