Subdomains?

Question, is there any way for this to work for subdomains?

For instance, when you enter the domain, FB only uses that exact domain.

I have five subdomains, is there any way to enter a correct site url so FB would use the correct link?

ie instead of having all articles go to www.site.com, articles would go to correct subdomains, news.site.com, ads.site.com etc.