The HTTPS method works great but only with the following conditions:
-The site actually offers an HTTPS Secured version. Sites like Facebook do, but most sites (particularly those that don't request information) do not.
-The network administrator only blocked http:// and not https://
-The network administrator didn't block entire IPs.
The IP method works fine only if:
-The domain is on a dedicated server with its own IP.
-The network administrator didn't block entire IPs.
For situations where the above conditions can't be met, I recommend a free proxy service or VPN such as
http://www.hidemyass.com/ (assuming this isn't blocked)