I simply want to know if is this normal, abnormal, deceptive, illegal, etc...
I am at work. When I bring up a certificate for most domains, I get a very standard certificate. When I bring one up for Facebook or Twitter (social media sites), the certificate throws a warning. The warning is because they are untrusted. Looking at the certificate, the Issuer is the company that runs the local network in our building. It is not a standard issuer.
This is exactly how it is listed (replacing the company name with xxx.com):
Issuer: DC=com, DC=xxx, CN=XXXsubCA