Thanks. I'm glad that cleared up.It is information from a Firefox extension called uBlock Origin. Basically uBlock Origin is an ad blocker. The information I posted is showing the web domains for requests that originated from the SAOCA forum page that is displaying this "FB GROUP" thread. It is showing there are some sort of requests being made to facebook and twitter. I didn't dig into page source code to see the actual purpose of those requests. Those could be just to bring in the Share This Page content you see at the bottom of the page.
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The *cdn* entries (e.g. fbcdn.net) are content delivery networks - CDNs. A majority of web sites use CDNs to replicate 'static' content, like images, over the internet. Your browser can retrieve static content from the replicated content copies provided by CDNs, instead of going back to the original web site. CDN providers will have many geographic access points and your browser will normally access the one that is geographically closest to you. That can greatly speed up page loading and avoid traffic volume to the "real" web site.
Mike