Swift 3.1 - Unable to fetch facebook friends id

I'm trying to print a list of my facebook friends' id but the result is empty. Any ideas?

  FBSDKGraphRequest(graphPath:"me/friends", parameters:["fields": "id"]).start{(connection, result, err)in

        if err != nil{
            print("errorGraph")
            return
        }

        else{
            guard let data = result as? [String:Any] else { return }
            let fbid = data["id"]

            print("friendID:", fbid ?? "")



        }}

This works:

var faceFriendIDs:Array<Any> = []


FBSDKGraphRequest(graphPath:"me/friends", parameters:["fields":"id"]).start{(connection, result, error)in

        let resultDict = result as! NSDictionary
        let data:NSArray = resultDict.object(forKey: "data") as! NSArray

        for i in 0..<(data.count){
            let valueDict:NSDictionary = data[i] as! NSDictionary
            let id = valueDict.object(forKey: "id") as! String
            self.faceFriendIDs.append(id)
        }



        print(self.faceFriendIDs)

    }