Missing posts at user's feed [closed]

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For our Facebook application we query users' public feed/posts/statuses using Graph API (to be clear: the application queries not the data of the user that uses our application, but other users' public data).

We use:

graph.facebook.com/#facebook_userId#/feed?access_token=#access_token#

graph.facebook.com/#facebook_userId#/posts?access_token=#access_token#

graph.facebook.com/#facebook_userId#/statuses?access_token=#access_token#

We use our application user's valid access token to make the query.

The problem:

For some of the users we query, we get no results on feed or posts, and get partial and outdated data when querying statuses

For other users we get data when using feed, but it's not all the posts on the wall (we have noticed the missing posts are ones with photos).

Can someone explain this behavior? Is there a way to get the full public data from a user's wall?

We opened a bug on http://bugs.developers.facebook.net/show_bug.cgi?id=20339 but will be grateful if someone helps us here.