"Take a look at Stephen Baker’s BW article ‘Learning, and Profiting, from Online Friendships’. ...Note the last line in the video ‘…if our friends like [the ads], we will too.’ and factor in Watt’s work on Friend Sense which suggests that we don’t really know our friends as well as we think."

A pie chart shows most tweets are coming in "from the Web" -- though some of the posts may actually be generated by RSS feed.

This gallery shows lots of examples of what can be done with the Google Visualization API.

Nicely executed map, chart and list of votes by name for and against the House bailout bill, H.R. 3997.

"The date slider is a Flash visualization that Measure Map uses as one way to navigate the site."