Behold a 1970s social networking site

An old sign asking users of public pay phones to keep their conversations brief

This, my young friends, is a (West German) coin-operated payphone. Like cigarette and bubble gum vending machines, they were ubiquitous during my youth. Now, this is literally a museum piece, which I spotted in Frankfurt a couple of days ago. Very rarely, people forgot to collect the coins that remained when they ended their call.…