https://goo.gl/eSXvga
靠着GOOGLE翻译翻一下
Facebook has repeatedly denied tapping into phones microphones for targeted
advertising, but just because it isn't doesn't mean it can't. According to
Metro, Facebook has applied for a controversial patent for software that will
allow smartphones to begin recording when they hear secret messages hidden in
TV ads.
Facebook已经申请了一项有争议的专利，
此专利将允许手机在听到隐藏在电视广告中的讯息并开始录音。
As reported by Mashable, Facebook could embed high-pitched audio signals in
broadcast content that