Are you trying to view our PBwiki videos but your work or school is blocking YouTube?
Don’t worry, we’ve uploaded all of the PBwiki videos to TeacherTube. TeacherTube is a great video site that doesn’t appear to be blocked by most employers and educational institutions. It’s completely safe for work and has other helpful videos and tutorials for both educators and students.
Take a look at the PBwiki videos on TeacherTube.
Here’s a PBwiki video uploaded on TeacherTube that has educators covering their favorite features on PBwiki.
PBworks Official Blog 
You can try a proxy site. My work. . . and school blocks access to myspace and youtube. You can access these sites using a proxy. Check out:
http://bypass.thezerogroup.com
You can also use the method in the following article to download YouTube videos even if you are blocked behind a proxy.
http://www.10minutesmax.com/technology/cant-access-youtube-at-work-2.html