I’ve been collecting postcards for years. The hobby of collecting postcards is called DELTIOLOGY!
> Greek deltí(on). . .diminutive of “déltos,” meaning writingtablet)
My collection is not focused on a particular theme or period in time. Rather, I have sought those that are humorous, cheeky, odd, bizarre, or have cartoons on them.
Postcards in my collection are not required to have a message on the back. I simply ask any friend who is traveling to bring back the wackiest, or best postcard they can find. I don’t want to burden them with finding a stamp while in . . .Sweden. That said, I have received many through the actual U.S.P.S.