My son is 17, he and all of his friends “tweet” according to them FB is “like so LAST year”! FWIW.
Over Christmas, I noticed this behavior from the youngsters in the family. They were tweeting from their new devices and said they weren’t as interested in FB. Ages are 15 to 25, and a nephew who is 30 now tweets almost exclusively. If this is a real trend that’s building, there could be a tsunami of youth catching the wave and leaving grandma and grandpa up a tree with their stash of grand-baby pictures.