Well, when misspellings (celfie) are considered new words, then of course the numbers go up.
When I do American crossword puzzles, I am already faced with terms that didn't exist a few years ago, like meme, but since I don't use Twitter, I am not likely to use any of the terms in that article. Especially since many of them are not only limited to Twitter but to a specific area of the States.
Balayage rings a Bell. Maybe one of these words that don't exist in French like entrepreneur I guess. Never read any of those - came across baeless and already forgot the meaning. Using ´slang' or strange words when you are a foreigner is a sure way to look like a fool both to the locals and to your own fellow countrymen ;-)
I'm just putting this here because it touches on another aspect of the internet -- words forbidden on the major websites.
Most of this is taken care of by automatic algorithms that block vulgar or obscene terms.
So I thought it was quite funny to read that tweets about Dominic Cummings were banned for a considerable period of time on Twitter because Twitter thought it saw something nasty in his name. The internet community apparently got around this by using deliberate misspellings which the Big Computer community is not able to block automatically.
An article in The Guardian pointed out that the town of Scunthorpe in Lincolnshire has also faced problems due to algorithms.