When my friends travel, they sometimes show pictures of the places they visited but almost never of themselves in front of the monuments. Actually, they rarely take pictures of themselves (of their kids, yes). So I am wondering who is doing that and in which context.
One for the family album, as they say.
My wife made me a year book for our "paper anniversary".
It contains selfies, and other pictures of us, sometimes together, sometimes in places, sometimes with friends.
Any idiot can take a picture of the Great Basilica of the Vatican State. But it is impersonal, no matter how well done it is, until it's got family or friends in it.
That's how a lot of people look at photography, and have been looking at it since its early days: a handy keepsake medium, something to jog your memory.
Come to think of it, I suppose that the people taking selfies run some sort of blog of their travels or even of their lives. I see little other use for this kind of pictures. I have also seen some filming themselves and describing the place, as if they were reporting on TV. That would be an explanation: they are running the equivalent of a low budget TV channel of which they are the main actors.
These two quotes makes me think that we didn't grow up on the same planet. It's the only explanation I can have for you not having been exposed to neither family albums nor home videos, not even on TV, in the movie theatre, by reading a book, or anything.