我将应用程序的默认活动隐私设置为“所有人”，但是当显示用于安装应用程序的身份验证对话框时，Facebook 会忽略此设置并始终显示“朋友”。
我已经用几个应用程序尝试过，但仍然是一样的。
此链接中还报告了有关此案例的错误： https ://developers.facebook.com/bugs/268481063205627
Facebook 在此处描述了默认活动隐私： https ://developers.facebook.com/docs/opengraph/authentication/
任何人都可以帮助我吗？或者你能告诉我是否有任何其他方法可以通过 PHP 代码设置活动隐私？
Depends on the user default settings, you can set an Activity Privacy,
but if the user have make any changes (Friends Only), you can't do something for this.
If the user changes it to Friends, the permission will be updated to friends only. If the user changes that to Public, your app activity will turn into public actions. Possible settings: None, Friends, Me only, or Public. The user can also change the Activity Privacy setting through the Auth Dialog.