Retrieving posts and comments from a Facebook page - facebook

Question

I want to retrieve all of the posts from a given facebook page along with the associated comments.
I wrote this code (app details obfuscated, replace with your own in order to run it).
<?php
require_once('facebook.php');
$facebook = new Facebook(array(
'appId' => 'MY_APP_ID',
'secret' => 'MY_APP_SECRET',
'cookie' => true,
));
$pages = array(
"stackoverflow" => 11239244970
);
$result = $facebook->api(array(
'method' => 'fql.multiquery',
'queries' => '{
"posts": "select post_id, source_id, actor_id, target_id, likes, message from stream where source_id = '.$pages["stackoverflow"].'",
"comments": "select post_id, text, username, fromid from comment where post_id in (select post_id from #posts)"
}'
));
echo json_encode($result);
?>
posts returns the expected results, but comments returns just one comment.
This example queries the stackoverflow facebook page
The comment returned from the comments query is "Joined!" (from this post). I can't figure out what's special about this comment.
Any thoughs?

Answer 1

I tried to find a solution playing with Graph Api
https://graph.facebook.com/me/fql?q=select message, comments from stream where source_id = 11239244970
is working but when returning comments it returns only the last 2. It's exaclty how Facebook itself shows the stream and comments with "View all XX comments" link.
To query the posts and comments together can be used:
https://graph.facebook.com/fql?q={"posts":"select post_id,message, comments from stream where source_id = 11239244970","comments": "select post_id, text, username from comment where post_id in (select post_id from #posts)"}&access_token=...
According to Facebook:
Each query of the stream table is limited to the previous 30 days or
50 posts, whichever is greater, however you can use time-specific
fields such as created_time along with FQL operators (such as < or >)
to retrieve a much greater range of posts.