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 ;-)