The Secret Social Graph

Quite an interesting article shows how Apache
"Accumulo<http://accumulo.apache.org/>"
cloud storage system (based on Hadoop) can be used to access control data.
Depending on your level of clearance, you will see different key/value
pairs.

It can also provide visualizations of the social graph in realtime.

http://arstechnica.com/information-technology/2013/06/what-the-nsa-can-do-with-big-data/2/