Facebook Realtime Updates - get notified when users friend updates photo - facebook

Using the Realtime Updates I can get notified when a user uploads a photo, but is it possible to get notified when one of their friends uploads a photo?

According to the docs you can't subscribe to changes to User.home (the user's news feed). This is where you would see friends' photos, so I conclude you can't get notifications for these events.

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How do I get realtime updates for facebook user actions?

Currently I have implemented facebook realtime updates . But here I am getting only user actions related to movie likes, statuses and normal likes. How can i get actions like music.listens, places checkins, videos watched etc.
You can only get updates for objects listed in here: https://developers.facebook.com/docs/graph-api/real-time-updates/v2.2

Facebook Realtime Comments on photos

I am currently using the Facebook realtime updates feature in my application. I am looking for comments, on photos, status updates etc. I have successfully got it to work on a status update, on a post of a photo to a wall and a friend's post on the wall. However I can't get it to work on a photo which is within the owner's album. Neither the updated time of the album nor the photo's updated time change. I want to limit my queries as much as possible.
What's the best way to approach this?

No new data after a RealTime update, and missing recent posts in OpenGraph /feed

I'm having a hard time getting access to most recent posts and comments for a given user using the OpenGraph API.
I have the read_stream permission, and get realtime notifications for feed field on the user object. The notification comes in, but fetching the /<user id>/feed stream doesn't include the new action.
When playing around with the Graph API Explorer, the data I see via OpenGraph and data I see by going directly to the page is different. Viewing my friend's profile, I see his latest update, yet it doesn't come back via /friend_id/feed. A comment I left a week ago shows in my /feed, but one from a few hours ago (which sent a realtime notification!) isn't showing up.
It's almost like some posts are filtered for the API. Is this how it's supposed to work?
My actual goal is to get all the comments made by my application's user.

Check feed/post update from user's wall without calling (pulling) graph api periodically

I know how to use graph api - https://graph.facebook.com/{id}/feed|posts to get user's and page's feed.
I also know that facebook provides an subscription API. But I can not use it to check feeds of users i am interested but not our application users (ex: A super idol I am interested but who is not our application users. I want to check not only posts by him but also messages posted by his fans)
Is there a notification service to notify me (callback) the updating of user's feed, such that I don't need to pull graph api periodically to check the updating?.
Thanks.
"I want to check not only posts by him but also messages posted by his fans" and "but not our application users"
This sounds like a stalker app. http://developers.facebook.com/policy/ Facebook says you are not allowed to do that.

With the Facebook OpenGraph, is there a way to get friends checkins through Real-Time Updates?

I am working on an app that is integrating the Facebook OpenGraph. I'm trying to subscribe to Real-Time Updates so that I can have my app automatically updated whenever friends of my users check in somewhere.
It appears that Connections are available in realtime with the User Object and checkins are a connection but through the OpenGraph Explorer I can only see checkins where people have tagged myself.
When you subscribe to realtime updates, Facebook only sends you data about the users who have taken actions in your app, not their friends.
But you will get all updates about a user which has added your app - which includes when one of their friends tags them in a checkin - along with that user's own checkins.