It seems weird that I can get a public page feed on facebook (posts, etc) by doing:
https://graph.facebook.com/cnn/feed?access_token=ACCESSTOKEN
but I can't get that info with their realtime api? Is it possible just to have any changes (posts created) get pushed to me with the realtime api by subscribing to a page, for example the CNN facebook page? It seems silly to just keep on having to hit the graph api every x minutes and check to see if there are any new posts since the last post id when the realtime api could just push them to me. Does anyone know a way to do this? What am I missing?
Thanks
In order to receive real time updates from the page, the app needs to be installed on the Page.
The real-time update settings doesn't let you specify a page_id so there is no way for Facebook to know which pages you want to receive updates from.
Seeing as you won't have permission to install apps to pages you don't have admin access to, you are limited to the method you are already using at the moment. The only way is to continue querying the API periodically and checking for changes.