I've got a friend group of a few hundred high schoolers (high schooler myself.) While many complain about changes in Facebook, none of them ever do anything about.

I have a few friends who have decided to leave Facebook, but it's always because they don't like the addiction aspect of it, not any trivial changes Facebook chooses to make.

That said, I really like the new features rolling out. They are definitely an improvement (except for the timeline, that shit's dumb.)

Isn't that true for just about all demographic groups?

Absolutely, they will happily download 10 IM programs and keep them all running at the same time, able to multi-task between a half dozen communication channels. I think any social network will dominate a teenager's attention.