I think its possible she came away with a good lesson . . . but I think its likely she learned the following (This is what I think I would have learned):
1) Dad is spying on my Facebook conversations with my friends
2) I need to use privacy settings
3) If Dad finds I'm doing something he doesn't like, he's going to fly off the handle, so I better make sure he doesn't find out
4) Dad has no respect for my belongings
5) I must make all efforts to conceal what I am doing from Dad, see #3.
Other things learned unconsciously:
1) Its ok to destroy things, even valuable things that aren't yours, when you are mad. (It might have been legally his, but I doubt anyone treated it as anything but hers until this happened).
2) If someone you love hurts you, hurt them back.
3) Mutual public humiliation is an ok way for families to interact.
Other than use privacy settings, I'm not sure any of that is really the best things to be teaching your kids.