Sometimes it is pointless and sometimes it is mandatory.
YouTubeProxy.org is one such site that lets you access Facebook, Twitter, YouTube, Bebo, MySpace, MySpace Videos, Hotmail, Gmail, Google, Wikipedia when they are blocked.
The links go through a proxy connection so the networks are not able to block those.
The site also provides options to encrypt URLS, use SSL, kill scripts, kill HTML title, and more to customize your experience based on your needs.
The site is ad-free and popups-free.
There are bunch of similar sites to get around blocked websites but YouTube Proxy stands out being a hassle-free experience. There is even a way to get around blocked websites by email!