They were uncommon where I grew up, but older houses still had them and were being slowly phased out as houses in the neighbourhood sold. Ours was one of the last in the area to be removed/replaced, when it rained the lines still crossed with the houses that had the upgrade.
Facebook did it as well, maybe a couple years after opening up to the non university crowd. Neither FB at the time or G+ years later gave any thought that their no pseudonym policies put someone’s safety at risk.