Facebook Married 

When people on Facebook who aren't actually married list themselves as married to each other for fun.

Person 1: Izzy and I are married.
Person 2: Wait, I thought you were gay.
Person 1: No no no, Izzy and I are Facebook Married.

Facebook Married by Lovelier than Lexie June 1, 2006

Married By Facebook 

Persons of the same or opposite sex or Facebook itself come into a technological binding agreement that confirms marriage.

That ring means nothing until you have updated your status to let your friends know that you have been Married by Facebook.

Yeah, the "wedding" was okay. But, they failed to update their status on Facebook, so naturally I am confused to why they spent so much time money and effort for such an event which I clicked "Yes" on Facebook.

Hey, just got Married by Facebook. Mobile Pics Uploaded

Married By Facebook by c-hat-e August 5, 2012

married on facebook 

This means a virtual marriage involving Facebook.
It isn't real and can be to just about anybody.

facebook marriage virtual married on facebook socialmedia marry married

married on facebook by Dragon Bubble March 16, 2016