Here's a further demo showing a social graph (Twitter friend relations at a BarCamp) with an image hack on ProtoVis' directed force graph: http://ianozsvald.com/2010/10/05/visualising-lanyrds-social-... It works great in Chrome/Safari and ok in Firefox. It runs like a dog on the iphone 3G. Kyran (who hacked ProtoVis) is working on a Canvas reimplementation which runs faster on mobiles.