This is a silly debate. Almost any FB profile has more than enough personal information about a person to draw a conclusion on their age, information that is superior in quality to a random ID check. If there is not an outright birthdate you can use the FB profile to age them in other ways. Once you are friended to the FB account you can also search the Instagram accounts and other social media to draw conclusions from that information. You also have the name of the person and the name of the person is usually also enough to determine their age if not exact birthdate through a basic internet search. You don't get to their FB account through an image search, you are invited there by a friend request FB sends automatically once their cellphone number is saved in your phone. I have been through this drill for 5 years now on SA and 90% of the time it's how it unfolds once you get a phone number except on the occasions when someone is using a burner or shared phone.
To argue that a person at a bar doing an ID search has an advantage over a person who already has a match to real pics, a real name and a FB and/or Instagram account is a comedy show. Neither is 100% foolproof but the point is that SA already put you in a superior position and advantage informationally to anyone seeing an escort and asking for an ID, because
(1) you have seen the girl's real pics on SA,
(2) you have gotten her phone number;
(3) her phone number in your phone has prompted an invitation to her Facebook, and
(4) once you have her Facebook you can access all her social media for even more info and these are 10 minute searches.
(5) The girl will have her birthdate or age in her Facebook and most of them do not have fake Facebooks. They have fake names on SA but once they give you their phone number the other information follows with it more or less automatically. I think some of them do not understand how Facebook works on privacy or else they don't think about it or care.
I will take the extent and quality of the above information over a random ID check any day of the week and so would any reasonable person. With a random ID check, you sink or swim with how good ID is. It is always better to have MORE information and not less. I don't understand why anyone would seriously debate this point.