On your Timeline, the "Activity Log" is a complete list of your photos and activities you have posted on Facebook. You have the ability to hide content or specify who sees certain items. Going through the Activity Log to tweak what is appearing to others is a good idea, especially for those who are prone to posting pictures they may not want coworkers or potential employers to see.
This video demonstrates how the Activity Log works.
What are your thoughts on the new look brought about by the Timeline?