Facebook allows users to attach images to their comments of Wall posts. Here's an example:
There is a limitation on Facebook's API side that does not allow tools like VSocial to pull a listing of attachments (i.e the images) from comments. This is a known bug by Facebook and they have triaged it. There is no known schedule for when it will be resolved.
You can monitor the bug at this url: https://developers.facebook.com/bugs/703455199671943