I have thoroughly examined the 'back-ways' in to hidden posts, and for those who have NOT enabled this feature, this is what the timeline looks like... Going back to the day that you were born!
...and so on... But the key is to hit the little grey box literally ON the timeline which reveals other posts, including their associated thread comments. You can find some real gems on people in those posts! It's wonderful. It's even more wonderful simply because *most* people don't even comprehend it!