Apple Safari Keeps Logging Me Out

safari : normal mode

safari : private mode

Problem : 
Apple Safari Browser keeps logging me out Facebook, Google accounts etc.

Most Likely Answer : 
You are using the private browsing function. Switch to Normal.

How to check :
What color is your browser bar ? 
Black means Private (logs you out after short time).
White means Save settings, history etc (not logged out after short time). 

How to fix :
Top right corner, the double pane icon.
Tap and change from private.

If you are using Apple Safari browser and keep getting logged out of facebook, google, twitter etc, check the color of your top bar. If it's black it's in private mode and will log you out of all your accounts in a short time. If it's white then you are in 'non-private' mode and your account settings will be saved.

Official Apple link : Safari browser private/normal mode