Meta Sr. Software Engineer interview questions

You get initial interview close to where you live, and then they fly you over to Menlo Park. Flying and interview at Menlo Park was a waste of time, since I answered all the questions, but then they said they have too many other good candidates. The place seems dated (old Sun building), not very well designed, filled with people who think they are cool and changing the world, but feels more like software sweatshop: open space, peer pressure, overworked staff, crowded. I wonder what will happen to them once they will get out of favor on stock market. They seem to be wasting a lot of money on unrefined processes; the company still feels immature.