I can’t add more Facebook pages but I’ve added a lot already

Generally speaking, whenever you have a problem that appears when saving (making a POST request), and it's dropping data, it's nearly always a problem with the max_input_vars setting in PHP. This defines the total allowed variables that can be sent as a POST request and menu items, JIG settings, Facebook pages tend to have a lot of variables being saved. Up it from 1000 to 5000, which will likely fix the problem. Here's how:

1. Navigate to the WordPress installation folder and edit the .htaccess file.
2. Add this line somewhere:
   
   php_value max_input_vars 5000

   1	php_value max_input_vars 5000

1. Locate and edit your php.ini file if you have access to it on your hosting.
2. Find the line that begins with max_input_vars (remove semicolon if found) and change it to:
   
   max_input_vars = 5000

   1	max_input_vars = 5000