https://status.github.com/messages is a better place to keep up with news like that.
edit that's not supposed to be as snarkey as it sounds reading it back :-)
edit again The reason for this intuition is that I assume that not being able to reach service.com could indicate a DNS problem. Possibly from the comments below I need to go and read a DNS book :-)
These sites are often hosted away from the main service, and thus available even when problems occur.