I am regularly seeing the people leaving hyperlinks in the comment boxes powered by facebook comment plugin. In most of the cases the hyperlink will appear as normal text only. On some specific comments alone it is showing as Hyperlink and if clicked takes to that website url. In some pages both types of links are there in the same page.

I just wonder how it is being done. If any one has idea about how it is being done, it will be greatly helpful for everyone who is doing commenting in facebook comment plugin powered pages. It may not be useful for seo, but it can increase the visitors to the url if it is an hyperlink instead of appearing as text.