Use my Facebook information to fill out my public BuzzFeed profile 
 
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– Tech pundits are still debating how big Facebook's new Timeline features will be—blogger Dan Lyons is in the it's-overhyped camp—but BuzzFeed has stumbled onto one indisputable fact: Timeline makes it really easy to see who has unfriended you over the years. Click here for the four-step process. (It involves calling up your friends' list from any given year and looking for the "add a friend" button.) "Prepare to be upset," warns Matt Stopera. (Want to get your Facebook Timeline ahead of the crowd? Click here to see a video explainer.)