I thought the the great LED screen rolled out on the ground during the opening was really the geek highlight for me.
“Laid on the ground of the stadium was an LED screen 147 meters long and 22 meters wide with 44,000 embedded LED beads. LED beads were also embedded on the costumes of performers.”
You can keep in touch with things Olympic thanks to fring too. In case you haven’t seen it yet, read all about fring and the Olympics here.