Anjo Anjewierden has analyzed some interelated blogs posts and drawn up the data - the visualization of blog conversations.

"Left to right is time (the data was 2004 posts of KM bloggers). Top to bottom is chronological order of a blogger entering the conversation. Colours are: blue (both links to and is linked from other posts in the conversation), red (is linked from in the conversation), green (links to the conversation). Note that posts by the same blogger on (nearly) the same day overlap each other (one pixel is one day).

For the example above, it is easy to see the "conversation" continues for a while (first post is Feb. 26, 2004 and last is Dec. 31, 2004). "

Via information aesthetics.