Facebook Tip #33: How to See the Relationship History of Any Two People on Facebook
1. Navigate to the profile of the first people you want to see and make a note of their username. You can find it in the URL.
2. Repeat the process for the second person you want to see.
3. In your browser’s address bar, type www.facebook.com/friendship/[username 1]/[username 2]/, replacing the usernames as appropriate.
Press Enter.Now you should be able to see all public posts where the two people tagged each other.