Facebook's new Timeline has me thinking about the way we can unexpectedly invoke our emotional histories thanks to the easy mining of our e-mail and social networking accounts. Almost everyone I have talked to has had this experience. You're searching your e-mail account with some innocuous phrase—"concert," "dinner," "orange juice," "you're breaking my heart," "why did you kill my puppy?"—and you unexpectedly stumble upon a years-old conversation you had with someone.
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