If you own an very old iPad ( as your small, gray colored hardware signature suggests ), then your options are very limited.
If you have an iPad stuck on iOS 10, you may have a nearly 11-year old, 2012 iPad 4th generation.
That year and model iPad is very old.
The ONLY third party Web browser left for such an old iPad is this one.
Tap the link below.
Alook Web browser
https://apps.apple.com/us/app/alook-browser-8x-speed/id1261944766
The ONLY third party updated and supported Web browser for very old iPad models.
Try it.
See if this help with your Facebook Website issues,,or not.
Good Luck!