A week ago, I posted a quick fix to a bug in the Sharebox tutorial. The next day, it appears that the site hosting this tutorial expired, and its content could be lost. Never fear! Google’s cached version is here. To make it easier for you, I’ve posted the source code developed through the tutorial to my Github and you can see Sharebox in action on heroku. Lastly, I’m also hosting a cached copy of the tutorial for safekeeping, in the event its lost overwritten in Google’s cache.
Hope this helps!