I m trying to get wall posts from a profile facebook. I have no problems with the fan pages and my user token is valid (at least for the fan pages).
Example with thi
This answer was written back when the Graph API version was in its first version. Back then you could get the user feed by using the user ID, right now the user ID is no longer shared between apps. Also facebook created a new API that it's only available to some of it's partners.
So right now it's impossible for you to get the public user feed, unless the user has used your app. You can still get the Pages feed though.
This answer was for graph api v1
So you must use this https://graph.facebook.com/529628444?fields=feed&access_token=YOUR_TOKEN
And if all you want is query public data you can create a APP Token by doing this:
https://graph.facebook.com/oauth/access_token?
client_id=YOUR_APP_ID&client_secret=YOUR_APP_SECRET&
grant_type=client_credentials
And use this token instead of using your user token.