That's Facebook's culture. They're building a new HQ building. It has one of the world's largest bullpens. Almost everybody is in one huge room.

(Floor plan: http://static.dezeen.com/uploads/2012/08/dezeen_Frank-Gehry-...)

Apple is at the other extreme - they keep their groups isolated, often behind locked doors. Microsoft used to run recruiting ads for programmers pointing out that their programmers get offices with doors. Google tends to have medium-sized bullpens surrounded by many small glass conference rooms.