I was going to post this on twitter but our IT department blocks it because of "adult language."
I've been blocked earlier today because of items that are "proxy" related, specifically this seems to include anything that has a tiny URL. I have a list of blocked items that I'm continually adding to in hopes that eventually it will serve as a back up support for libraries' increasing need for "social networking" tools and availability.
The above link that I started with here was not blocked, fortunately. It may be of interest to making lists of free software and free software documentation (manuals.)
Check it out!