When they did it, I have no clue. However, Facebook now affords individual users a far greater degree of control over who sees what in his/her profile. This is really good because if your life is still interesting, you might not want to share all of those interesting experiences with, say, your family.
It also lets you limit the portions of your profile that people can view. So if you are stuck friending a person you don’t really care about, you can restrict them to the basics.
I recommend you play with the “Custom” privacy settings on your profile, and on individual photo albums. Set it however you want, just make sure you are comfortable with it.
Facebook doesn’t really protect your privacy, even with these added features., so be mindful of what you post. You never know who is mining the data or looking at it.