It is very intuitive method to view 360 photos - just have a picture open on your Facebook App for Android or iOS and move your hand around. The panorama begin to move with your movement.
If you look 360 images on your computer, you have to click and drag to the direction you want.
You can try this by open the 360 image below on your FB App or on your computer.
Now we at Sociotrope are waiting for 360 Photos on Instagram. Still to come? What do you think?