The images shown here are from a short, dynamic visualization of edits to Wikipedia pages from December 1st to February 20th, 2011. It focuses on pages about nations where protests and revolutions occurred as well as pages about the protests themselves. Edits are color-coded by type, with orange-red lines indicating changes that added to a page whereas purple indicates changes that removed text from a page.
Each pulse is a day, but the graph actually displays the current day plus any edits that occurred that day or during the prior six days, so it's actually showing a week of edits at a time.
The editing was visualized in Gephi, an open-source network analysis package.