Facebook introduced the 360 degree
photos uploading feature a while ago. When you upload a 360 photo in your
story, you and other can view your photo in 360°. That is you can tilt your
phone or swipe left, right, up and down to see the all things around the 360° photo.
This is the cool feature you must use right now.
How to upload and post 360° photo to Facebook with iPhone You need to take a 360 degree photo before you begin.  Step1# Simply Open the Camera App  Step2# Switch to Panorama mode
How to take 360 degree photos from iPhone and Android
A Facebook 360° photo is a photo that
allows you to view the scene from every angle: above, below, behind and next to
you. You can create 360° photos taking a panorama on your iPhone and Android.
When you share 360° photos on Facebook,
they’ll automatically be converted into an immersive 360-degree view.
How to upload and post 360° photo to Facebook
with iPhone
You need to take a 360 degree photo before you begin.

Step1# Simply Open the Camera App

Step2# Switch to Panorama mode 
How to upload and post 360° photo to Facebook with iPhone You need to take a 360 degree photo before you begin.  Step1# Simply Open the Camera App  Step2# Switch to Panorama mode

Step3# Capture any Photo taken with this mode
It will save your Panorama photo in your
Camera Roll

Step4# Now launch Facebook, Go to Photo option or What’s on your mind? You can apply with any one option.
How to upload and post 360° photo to Facebook with iPhone You need to take a 360 degree photo before you begin.  Step1# Simply Open the Camera App  Step2# Switch to Panorama mode

Step5# Now choose and upload your Panorama Photo you have
taken. Select starting view of your photo.
Step6# There you will see the 360° upload button where you can enable 360° photo or you can remain as panoramic photo by tapping on that icon.
How to upload and post 360° photo to Facebook with iPhone You need to take a 360 degree photo before you begin.  Step1# Simply Open the Camera App  Step2# Switch to Panorama mode

Step7# Write any caption (Say something about this…) if you want, tap on
Post.
After all done, you can see your photo
in 360 degree by tilting or swiping on the screen of your iPhone.
Likewise other people on Facebook can
also see you photo in 360 degree.
That’s it. If any confusion feel free to
comment down below. 
For more info here