If you manage a site with multiple subdomains, tracking Facebook referral traffic will soon be simpler.
Facebook is changing how it records data on its Domain Insights dashboard to count clicks on subdomains as part of the total for parent domains. From the Facebook Developers blog post:
For example, suppose a person clicks on a link for http://someredirector.com which does a HTTP redirect to http://some.example.domain.com. Previously, we would have recorded the click in the Domain Insights for someredirector.com and for some.example.domain.com – and if you viewed the Domain Insights for example.domain.com or domain.com you would not see the click. If you had a large set of subdomains you would need to monitor Domain Insights for all of them.
With these changes we will now record the event in Domain Insights for someredirector.com, some.example.domain.com, example.domain.com, and domain.com – you will now be able to see the sum of all subdomain activity in the Domain Insights for domain.com.
The change will happen in the next several days.