Shaina Olitsky, of Germantown Academy, is all smiles as she is getting her prom dress fitted by Rita Schaer at Bala Girls in Merio Station, Pennsylvania. Perhaps the best thing to happen to proms since Humvee limos and spray-on tans, new Facebook groups where girls post pictures of their prom dresses ensures there are no “who wore it best” moments on the big night. (Michael Bryant/Philadelphia Inquirer/MCT)