a set of time-based graphs that convey thousands of thumbnails from YouTube movies for specific tags, such as 'joke', 'cat' or 'wedding'. the thumbnails create a kind of "heat signature" which shows the increase in activity in YouTube in the last few months. vertically, the thumbnails are positioned by the hour of the day they were uploaded, & horizontally by the day of the year.
see also flickr tag graph. & Yahoo taglines & flickr image blending.