> Facebook's UI has changed significantly over the last 15 or so years. Features have appeared and disappeared, boxes have been arranged and rearranged. But there's rarely a big fuss beyond it getting a little slower each time (roughly commensurate with consumer hardware speedup, in fact). People don't really notice and they don't really care.

Are you using the same Facebook as I do? Every time they rearranged more than a single button there was an uproar. People do care, but there's exactly nothing they can do except whining. Facebook doesn't care, and people won't leave because their friends are there.