Earlier quoted context omitted.
My visceral reaction to the idea of one giant room was "Rad". Love open floor plans. I'm really curious what the final interior plan will look like; presumably it's not some huge airplane hanger of openness but some clever way of staying open-while-interesting. Like you, though, I'm just excited at the prospect of larger companies doing something different. Should be fun to watch.
They (Facebook) should really look at what research has found before they jump feet-first into having an open floor plan. It's not like they've just invented it! Open floor plans were invented as a way to cram more people into less space, thereby minimizing cost of office space per employee. They were not invented to improve productivity.
Speaking of research, they should also find out how much it costs to maintain a Ghery building. If you think Facebook stock is bad now wait until you see how a Ghery building affects their bottom line.