Social Database Patterns
github.com
github.com
For example in this pattern here: http://dbpatterns.com/documents/507c943589cbad13b228926a/
It would be nice if the author could specify what the query for "Does user with ID X have permission with ID Y"
See http://thinkaurelius.com/2012/08/06/titan-provides-real-time...
Use the age old trick to get the cached copy from Google -
cache:dbpattern.com