How does this patent APPLICATION harm anyone? It discloses some technical information (though clearly this is already a well known idea), and Facebook will neve

How does this patent APPLICATION harm anyone? It discloses some technical information (though clearly this is already a well known idea), and Facebook will never be awarded a patent for this. The public benefits from dud patents because they disclose in fairly precise (though esoteric and overly longwinded) language some technical idea while the applicant does not gain anything when it is eventually rejected.