To revist this article, visit My Profile, then View saved stories . To revist this article, visit My Profile, then View saved stories . To revist this article, visit My Profile, then View saved stories . now: political parties, your book club, freelance journalists , the social networks you're signed up to, your parents, that online store that you only bought one item from a decade ago, and many, many more. What do a lot of those email senders have in common? They want to know whether...

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