Is there any real significance to adding people?

To see where they're going?

Only if you want to follow their posts.
Or if you want to converse with them but they have their settings to friends only messaging.

People used to collect stamps or coins or comics.
These days its people.

no. only thing is if their pics are private and they have to add you back to view them other than that it has no purpose

I don't,,,,,i'll talk to people if msg,,,,,but no,as soon as you do,they quit talking to ya,,,,

Also you can have photo albums set to Friends only .. so adding gives access to them.

Well HUN with a user name like that I'm defo following 😏

on facebook I have mostly family and a few personal friends,