From my memory, the timing seemed to align with Facebook. Moving from anonymous chatrooms to proper Social Media with a/s/l information and more already populated.
Even worse though, she doesn't know any of the early memes. Hampster Dance, Badger Badger Badger, Peanut Butter Jelly Time, Leeeeroy Jenkins. Salad Fingers. How does a young, gothic lass get through her teen years without Salad Fingers?