By 5 websites I mean you cannot link to any external pages.
One - YouTube. Has almost everything that's on Grooveshark and hundreds times more.
> Hacker News
Two - Pick reddit instead. Much of what's on Hacker News is on /r/programming and other reddits, and the bits that aren't are outweighed by reddit being about 100 times bigger.
> Django Documentation / Stack Overflow
Three - Any complete Ubuntu (or Debian) download mirror. If you really read the docs and spend the time, you might be able to figure out what's going on without needing StackOverflow. And Django documentation is included. Of course, this assumes that you have some sort of PC to make all this work.
Four - Also, Github helps with the above. Also, you should be able to get the compiled version of some virtualisation software or whatnot on there. Or make an argument to one of the users that they should upload something crappy like the compiled version of VirtualBox-OSE to Github.
Five - And lastly, Wikipedia. Mostly because between this and Google Maps, Wikipedia includes, in a way, much of Google Maps but not vice versa.
Between all these, there should be enough there to make sure that one isn't in an echo chamber, but has a genuine chance of contributing to the world.