Simply put, why was Scott Hassan in Vancouver? Because TED2014 was happening there – and, instead of bringing Snowden physically, the Beam offered Snowden a way of connecting via remote presence. And Chris Anderson demonstrated the excellent way of communicating as a remote person incredibly well.
UPDATE: TED puts out the video of Snowden and allows for downloads of the talk.
photo credit @jamesjoaquin
photo credit @chrisfralic