Retrieving all Facebook comments from one domain

We have implemented facebook comment plugins on some of our pages.

And now we would like to have a page that will list all the comments made on those pages (or on the same domain)?

Is there a way to do this? I noticed it exists activity feed

for one domain, but it doesn't include commenting.

In addition, there is a graph api for displaying comments from a page using GRAPH API

, but we have thousands of pages. It will take a long time for this, even if we cache it.

So I am wondering if there is a way to do this.