Facebook API -- write a comment on friend's wall posts

Question

Need a way to post a comment on a friend's wall post through the Facebook API (I'm using the Python wrapper).

Consider two users, Alice and Bob. I have read_stream and write_stream permissions for both users.

>>> alice_graph = GraphAPI(alice_access_token)
>>> bob_graph = GraphAPI(bob_access_token)

# Alice makes a post on her own wall, which returns the objects Graph API id
>>> alice_graph.put_wall_post("test_message", attachment={'name' : 'some_name', 'link' : 'some_link')
{u'id': u'some_facebook_id'}

# Alice can comment
>>> alice_graph.put_comment('some_facebook_id', "test comment")
{u'id': u'some_other_facebook_id'}

# But Bob cannot comment
>>> bob_graph.put_comment('some_facebook_id', "test_comment")
*** GraphAPIError: (#100) Error finding the requested story

Interestingly, this only happens when Alice's wall post has an attachment. It does not happen if Alice makes a wall post with no attachment, just a message.

I'm totally confused as to how the permissions could be any different between wall posts with attachments and wall posts without them.

Anyone know what I'm doing wrong?

Answer 1

This ended up only happening with Alice -- with other users Bob was able to comment on their wall posts. I'm chalking it up to Alice having weird Facebook privacy settings.