Some survey statistics about social network use in the U.S., by Pew.
The program and papers of PETS’13 (The 13th Privacy Enhancing Technologies Symposium) is out. Some interesting stuff there, including Privacy Technologies: An Annotated Syllabus and The need for flow fingerprints to link correlated network flows.
Immersion is a powerful visualization tool for email inboxes (see that cute bubble graph above). Also, an interesting way to understand what can possibly be known about us just by looking at our email inbox metadata. Its privacy controls are very simple, but very powerful: you can delete everything when you log out.