List of "Share" the system collected is not equal to the number displayed in facebook because of
If you are running a promotional event inviting people to share your post, tell your fans to share it as "public". This will ensure that their shares will be visible to both our system and to you.
List of "Like" the system collected is not equal to the number displayed in facebook because of
1. Collectible "Like" is "Like" from actual person(account). Likes from Facebook's "promote" campaign will not be collected.
2. Privacy setting of "Like" owner account makes their account inaccessible.
Why are some comments not displayed here?
1. Some comments are spam. Facebook will not display them.
2. Comment author's Facebook account has been suspended. Facebook will not display any comments written by them.