I think his point was that the actual search results refer to a particular page on each site, but your's only show a reference to the site as a whole. Thus, where you show 4 facebook icons (and so the results appear to be repeated), the actual results are to four different facebook pages (probably of four different peoples accounts) and so aren't acutally repeats.
You are exactly correct that the favicon links to all subpages. Example the FB favicon will take you to fb.com or fb.com/obama, scrolling over the favicon will show you a preview of the result page and the url before clicking.
But even linking to different subpages I think Google would prefer users not see multiple FB, Wikipedia, ect... results and that is just one rationale I offer for Google having an interest in limiting results/page (the question of the original submission).
