The entire Tumblr cyberpunk community will probably have piled onto the original poster by the time this post finishes doing its rounds, but I’ll throw in my own (only semi-pissy) note here:
“Steampunk” as a term specifically originated as a riff on the word “cyberpunk” back in the ’80s, gradually gaining traction from there. Some of its endurance can probably be traced to the fact that one of the more pivotal books in the genre, The Difference Engine (1990), was authored by two leading lights from the cyberpunk scene: William Gibson and Bruce Sterling.
Problem is, once people realized that you could add “punk” to the end of random words as a genre signifier, we started seeing an explosion of increasingly loosely defined would-be-subgenres: dieselpunk, atompunk, biopunk, dungeonpunk, solarpunk… (Admittedly, I’m guilty of it as well, having coined the semi-sarcastic term “sideburnpunk” to describe the distinctive look and feel of ‘70s science fiction and futurism.)
By and large, the people who coined those names wanted a convenient way to group together sci-fi works with a similar (usually retro-futuristic) aesthetic. In doing so, though, they diluted the “punk” part of the equation - specifically, the bottle-throwing masses-against-the-classes ethos that defined a lot of that early, “classic” cyberpunk - to the point of complete insignificance. A lot of modern steampunk is about as punk rock as a Yes double-album (helpful tip: fewer gentlemen adventurers with gear-hats, more labor agitators and colonial uprisings), but it’s hardly the only offender - post-millennial cyberpunk seems to have shifted away from the anti-authoritarian edge-dwellers of Gibson and co in favor of focusing on the authorities themselves, with more and more stories now written from the perspective of soldiers, policemen, corporate enforcers, and other various other incarnations of The Man.
Summing up cyberpunk as a genre has also become more difficult as many of the elements that originally signposted it (cybernetic prosthetics, megacorporations, a networked society where information has increasingly become the currency of choice) are no longer yesterday’s speculation, but today’s headlines. Even its aesthetic can be a fairly amorphous thing: where steampunk and other retrofuturistic styles are fossilized - tied as they are to specific time periods - cyberpunk “style” now covers more than three decades and can run the gamut from ‘80s techno-goth throwbacks to the sleek Renaissance-inspired visuals of Deus Ex: Human Revolution. “Essentially like steampunk but to the point where Internet has come into the picture” really doesn’t even begin to cover it.