where THREE of these things were screwed into one of those porcelain keyless lampholders in the middle of the living room ceiling. Extension cords were plugged into this outfit and "radiated" out to every corner of the room, and then some.
There are still dwellings where the only available "receptacle" is one of those taps screwed into a lamp socket dangling from, or screwed to, the ceiling.
I use one over my workbench for the light. I installed a surface mount porcelain receptacle on the underside of a shelf and needed a switch to turn the bulb on and off. Presto. And when the chain finally pulls out of the device -- as they often do -- you just replace and chuck out the old one.
And before any of you go after me with the electric cattle prods, no, it's not one of those open-terminal cleat lampholders. It's got a porcelain collar that screws over the base to cover the terminal screws all nice and proper like.