Realities
Exposure from a young age to the realities of the world is a super-big thing.
European nations began World War I with a glamorous vision of war, only to be psychologically shattered by the realities of the trenches. The experience changed the way people referred to the glamour of battle; they treated it no longer as a positive quality but as a dangerous illusion.
Fantasy is a necessary ingredient in living, it's a way of looking at life through the wrong end of a telescope, and that enables you to laugh at life's realities.
Social media forces girls to bear witness to painful realities of relationship that were previously hidden from view. It is a new kind of TMI, or 'too much information': publicly posted photographs of an outing or party you did not attend, or a personal web page like Formspring, can send a girl into paroxysms of anxiety and grief.