Blank Facebook page in iPhone’s Safari after logging in

I use iPhone 7 Plus (11.4) Safari for occasionally accessing Facebook with my wife’s account. So I logged out her account to log in with my own account. I did access m.Facebook.com but with a complete blank page. I’ve tried different browsers; same problem. I’ve tried clearing cookies, history, data, but problem remains. I used to be able to access Facebook directly through links in my (mobile)Twitter account. Not anymore. On Twitter nothing loads up, and I get that annoying “oops! There seems to be a problem, try again” I have looked into iPhone’s iCloud keychain, but I don’t see either Safari, Facebook nor Twitter there in order to try clearing saved passwords. I have tried hard booting and re-starting, at no avail. I am searching Online. Too many people with that problem (blank Facebook page), but no answers that I haven’t already tried.