If you’re a long-time fan of NBC’s The Office like me, you’ll remember Princess Unicorn circa 2008. She was the must-have, limited edition Christmastime doll that Dwight Schrute bought in mass quantity and sold at a markup to his Dunder Mifflin colleagues. What you might not have known is that the geniuses behind The Office built Princess Unicorn a relatively covert but hilarious online presence, a nascent example of NBC digitizing plot lines. TV show plot lines incorporate and even hinge on social engagement and interactivity in progressive and immediate ways. This has po…