Add support of Facebook oEmbed

Fixes #3532

wagtail/wagtailembeds/oembed_providers.py

@@ -82,6 +82,22 @@ OEMBED_ENDPOINTS = {
         "^http://instagr\\.am/p/.+$",
         "^http[s]?://(?:www\\.)?instagram\\.com/p/.+$"
     ],
+    "https://www.facebook.com/plugins/video/oembed.{format}": [
+        "^https://(?:www\\.)?facebook\\.com/.+/videos/.+$",
+        "^https://(?:www\\.)?facebook\\.com/video\\.php\\?(?:v|id)=.+$",
+    ],
+    "https://www.facebook.com/plugins/post/oembed.{format}": [
+        "^https://(?:www\\.)?facebook\\.com/.+/(?:posts|activity)/.+$",
+        "^https://(?:www\\.)?facebook\\.com/photo\\.php\\?fbid=.+$",
+        "^https://(?:www\\.)?facebook\\.com/(?:photos|questions)/.+$",
+        "^https://(?:www\\.)?facebook\\.com/permalink\\.php\\?story_fbid=.+$",
+        "^https://(?:www\\.)?facebook\\.com/media/set/?\\?set=.+$",
+        "^https://(?:www\\.)?facebook\\.com/notes/.+/.+/.+$",
+
+        # At the moment, not documented on https://developers.facebook.com/docs/plugins/oembed-endpoints
+        # Works for posts with a single photo
+        "^https://(?:www\\.)?facebook\\.com/.+/photos/.+$",
+    ],
     "https://www.slideshare.net/api/oembed/2": [
         "^http://www\\.slideshare\\.net/.+$"
     ],