The Pages JSON feed (e.g.https://www.facebook.com/feeds/page.php?id=%2019292868552&format=json) is now deprecated and will stop returning data from Jan 28, 2015 onwards. Developers should instead call the feed edge on the Graph API's Page object: /v2.2/{page_id}/feed.
Though I can't find a way to access a feed without authentification !Facebook is becoming more and more liberty killer and is withdrawing into himself !