Social network graph of #sla2009 tweet replies to June 19, 2009.
The more lines you have, the more @replies to different people you sent. If you don't appear on the graph, but know that you sent out @replies, it's because the person you sent your @reply to never sent out an @reply and so that person won't appear on the graph and unfortunately, you can't either! Interestingly, a few people only sent replies to themselves, so they do appear on the graph as a line that goes back to themselves.
Based on the code of www.eskimoblood.de/2008/02/09/how-to-draw-a-network-graph/ and created using Processing.
Full blog post explaining how I created this graph: