When I used facebooks Graph API til yesterday, it worked to get the "from" field in a comment (API vers. 2.10).
But today it returns an empty field. Does someone maybe knows if they changed something?
The current Version (2.12) also returns nothing.
You need to make this call with a page access token now, not a user access token. More info here https://developers.facebook.com/docs/graph-api/changelog/version2.11#mapi
/page/* — User information will not be included in GET responses for any objects owned by (on) a Page unless the request is made with a Page access token. This affects all nodes and edges that return data for objects owned by a Page.