Read the following passage carefully and choose the most appropriate answer to the question out of the five alternatives.
Facebook’s data policy has come under fire after it emerged that more than 50 million users’ information was open to political exploitation. Facebook announced on Wednesday (March 28) that it is reviewing its data policy. Security and legal experts say there is a major flaw in the current policy. Even the highest privacy settings do not prevent Facebook from collecting information about you. These settings affect the way you share content with people on the social network. Facebook collects information about your posts, pictures, the location of pictures, the types of content you view on the social network and how long you dwell on such content. It also collects information about how you use the services, such as the types of content you view or engage with or the frequency and duration of your activities. This results in complete loss of privacy to an unknown source. Facebook collects information about your friends and the groups you are connected to, to build your profile. What they upload about you and the information they tag you with contribute to the detailed profile of you. If you use their services for purchases or financial transactions (like when you buy something on Facebook, make a purchase in a game, or make a donation), they collect information about the purchase or transaction. This includes your payment information, such as your credit or debit card number and other card information, and other account and authentication information, as well as billing, shipping and contact details. All these information have allegedly been used to understand a person's personal choices and rights. Leakage of such data is a major security threat and can change the course of action of this century.