Well having a teenager… the “dress up” part will have to be minimal. My daughter came up with the idea of “Facebook”… but her idea was to just walk around with a book and when asked “What are you?” she would put the book up to her face and reply, “Facebook!”. Good idea but not a good costume… so Mom took it to the next level.
I created a trompe l’oeil headpiece which was an image of a book…complete with real looking pages. Didn’t want to have any Facebook logos or text on the book. It is meant to be uber-simple. She placed her face through the hole and at the back there was a cardboard strap to keep it in place on her head. She wore black.