A light bulb is the biggest thing since the light bulb? The light bulb was the greatest invention of the 20th century, but the story is about to an energy saving light bulb sold at Home Depot?
The light bulb was invented in the 19th century. A patent was granted for an incandescent lamp in England in 1841 but the first commercially viable design was by Edison in 1879.
I think the story itself, however, is a demonstration of an extremely annoying web site design.
The light bulb was invented in the 19th century, but did not become important until a massive electricity infrastructure was built in the 20th century.
If the joke was about the horrific web design (and it was horrific), I didn't get it.
"Important" is a relative matter of course, and surely light bulbs were not as ubiquitous in 19th century as they were later, but e.g. London had 2.5 million light bulbs at the end of 19th century. That is not insignificant.
