Ever want to view all the Facebook posts you and your significant other have both been tagged in or shared? There's a hidden URL for that. Go to https://www.facebook.com/us and the page will list all the posts both you and your partner have been mentioned in, including posts where others have tagged you both.
When you visit the page, it switches to something like facebook.com/friendship/[yourfacebookID]/[partnerfacebookID], so if you want to see a relationship history with a different person on Facebook, adjust the last part of the URL to the other person's Facebook ID.
This tip comes to us via BetaNews, which shares other Facebook tricks you might not know about.