Facebook is in the process of rolling out a huge, and potentially privacy-threatening, change to the way it displays your profile on the site.

It’s called Timeline and it makes it way easier than it was before for people to dig into every single thing you’ve ever done on the site — every photo, every status update, every relationship change.

Pull up someone’s profile with Timeline enabled and you can scroll back through their entire post-Facebook history. Click on a year (say, 2007) and you’ll see everything they did in those 12 months...