Spam, visually
Raymond Chen has an interesting visual for us: every spam and every virus he received between April 22, 1997 and September 10, 2004, graphed by time (x) and size (y). It captures the gut feeling I had—that spam was at its worst in early 2003 when spamming technology outpaced spam filters and the public’s knowledge about prevention.
On September 11, 2001, I posted a graphic bearing a faint similarity in concept: the traffic on the Internet as panic set in.