When I was reading James W. Pennebaker's "The Secret Life of Pronouns," I started consciously collecting as much personal data as I could for this exact reason. I'm 23 and I've got most of everything I've ever done on a computer since I was around 14 logged. I started thinking about the amazing insights that all of this data can reveal to me in the future. Every IM conversation, email, blog entry, text message, tweet everything I've liked on Facebook. I can only imagine in 20 years, having a psychiatrist ask me what my childhood was like and being able to show them a piechart of how many times I complained about something to someone.