FlowingData: How to Make an Interactive Network Visualization

I have looked at d3 network visualization demos / tutorials before. I always tell myself I will do it. But I need to get on this. Link below is to a tutorial on flowing data. https://www.google.com/producer/editions/CAowtpoM/flowingdata/CAIiEP1jg1drOnN8PC3TcT9b0fUqMggEIhDlFy4k5ajnTsfC5QXSbl75KhwIACIQ_IySbXiwavHpyb8VqOTmZCoGCAowtpoM/how_to_make_an_interactive_netwo