The Facebook icon looks like a blue box with a white "f" in it. If you’re not automatically logged in, log in with your Facebook account. You will have to enter your email or phone number and your password. You can use the search function, or click on your friend’s name on your Friends List or News Feed. This button is on the right side of your screen under your friend's cover photo. Tapping on it will open a popup menu. This will take you to a new page showing you and your friend's mutual friends, posts on each other's walls, and photos together. This button is at the bottom of the Photos window. Tapping on it will bring up a list of all photos that you and your friends are tagged in together. If you don't have many photos together, you will not see this button. Instead, you will see thumbnails of all of your photos together. Tap on a photo to zoom in.
Open the Facebook app. Go to your friend’s profile. Tap the  ⁝  button. Tap See Friendship from the menu. Scroll down and tap on See All Photos.