Sorry for the delay in getting back to this.
Right now, you can display the Facebook comments count for the page by simply adding the {JFBCCommentsCount}. That will display the number of comments inside the string COM_JFBCONNECT_COMMENTS_COUNT, which you can edit in your language file.
There isn't a way to get the comment count programmatically though, so that you could add it to the Disqus count. My best suggestion would be to have a line that's like:
There are 5 Facebook and 3 Disqus comments for this article
That should be do-able if you can get the count from Disqus
Hope that helps, but if not, let us know,
Alex