Im going to presume you're saying you can't view Youtube content as it has been blocked..
A lot of places put a ban on youtube. For some there is an easy way around it. Youtube.com is the American site which they ban so try the Australian version. You can copy the end of the (american) link and attach it to the (australian) link. See below.
http://au.youtube.com/ - Australian site
For example:
If the link on the forum is
http://www.youtube.com/watch?v=o8U2_XLcyOg and you cant watch it then do this:
1. Copy this part of the link: /watch?v=o8U2_XLcyOg
2. Add it to the Australian link:
http://au.youtube.com/watch?v=o8U2_XLcyOgor alternatively just replace the \"www\" with \"au\"
This worked for me when i was in a government job. They only block the american version of Youtube. If it doesnt work then chances are they have blocked all of youtube and/or flash sites.
Another alternative is Yahoo video as it was recently relaunched. It is a flash based site though.
Jimmy