Facebook不再返回all_mutual_friends

Question

I implemented graph api call to get mutual friends between two users, it was working fine but suddenly stopped working. I have this api call

graph.facebook.com/v3.0/{facebook_id}?fields=context.fields(all_mutual_friends)&access_token={access_token}&appsecret_proof={appsecret_proof}

It returned the mutual friends in this call, but now the response is

{
    "context": {
        "id": "..."
    },
    "id": "..."
}

And if I try to make a second call using context id I get an empty array

graph.facebook.com/v3.0/{context_id}/mutual_friends?access_token={access_token}&appsecret_proof={appsecret_proof}

{
    "data": []
}

Both users have users_permissions accepted. Mutual friends api is pending to review but it should work between developer users, isn't it?

Answer 1

Mutual friends can only return users who authorized your App. That includes the list of mutual friends too, not just the two users in question. Which makes the Mutual Friends API pretty pointless, i guess. That is why they removed it:

https://developers.facebook.com/docs/graph-api/changelog/breaking-changes#friends-4-4

The Mutual Friends API is no longer available.