Why is app_id required for facebook dialog.feed

Question

I use

facebook.com/dialog/feed?app_id=...&caption=...&description=...

Because it allows me to dynamically set the contents of the sharing dialog.

I do not understand why app_id is required for this.

Any thoughts?

Answer 1

in the documentation: https://developers.facebook.com/docs/reference/dialogs/feed/ app_id is used to identify your application, so the following requirement can be confirmed by Facebook backend systems. This requirement is "Please note that the above example assumes that the user has already registered and allowed your application."

Old sharer.php is deprecated. I could only assume that this was due to abuse by people using it without an application or user authorization. Remember the days when we could trust our neighbors and leave our doors unlocked? No more these days.