This essay provides an ethical analysis of the Cambridge Analytica case, focusing on the company's data collection practices and their impact on Facebook users. The analysis begins with an introduction that outlines the key ethical issues, including privacy violations and the unauthorized use of user data for behavioral analysis and political campaigns. The essay then applies four ethical theories – Utilitarianism, Deontology, Contract Theory, and Virtue Theory – to evaluate the actions of Cambridge Analytica. The Utilitarianism section assesses the consequences of the company's actions, while the Deontology section examines the duties and principles violated. The Contract Theory section explores the breach of social contracts related to data privacy, and the Virtue Theory section evaluates the moral character and virtues involved. The essay concludes that Cambridge Analytica's actions were unethical, based on the failure to comply with ethical provisions outlined in the theories. The analysis includes references to relevant sources and provides a comprehensive understanding of the ethical dilemmas presented by the case.