Really?  I assume all 20,000 people aren't close personal friends.<p>I work at a company that's an order of magnitude bigger, and I interact with about 5 people on a daily basis and maybe know the names of about 20 people there.  (We have a big building, so the team I'm on mostly has the floor to itself.)<p>I am sure there is groupthink among the 5 of us, but I'm not sure that there's an opportunity for us to think like the other 280,000 people.  If we do, it's a coincidence.