Lots of organizations adding URL filters in order to block people from surfing in unwanted websites, i.e - facebook, linkedin, gmail, hotmail, youtube etc.
In order to bypass these filters (at least worth to try), a worker may surf through an anonymous proxy. I like to work with CyberGhost or TOR, but if you are restricted from installing applications on company's PC - go to http://www.roxprox.com/
If it won't work, You can find more proxies in the following link: http://www.proxy4free.com/page1.html
By surfing without proxy I can see my real IP address:
After connecting the same website through the proxy above, my IP has changed:
Note - The URL has changed to proxy's web site and the domain "myipaddress.com" is encrypted.
Important, all data can be decrypted by proxies. I guess that you understand the risks.