[Sileni]

RE:2) Anecdotal confirmations:

Worked in a large lab that had a pretty good cafeteria, where they would rotate caterers in over time. Lunch meetings were regular, and when there wasn't an actual meeting, I'd grab a co-worker or one of the project leads to have lunch with. Really laid back affairs over all, but I feel like I learned a lot during these impromptu meetings. Often, about things that had nothing to do with what we were working on, but ended up being useful. Got to meet a lot of people I wouldn't have otherwise because people would show up mid-conversation looking for a place to eat.

On the opposite end, my current job is effectively a cubicle farm. No one talks to each other unless necessary, and only a handful of people ever go to lunch together. Cliques are a fact of life here, but I'd bet the average person feels more lonely here than at the previous office.

I'm not saying it's entirely caused by the dining area. But the dining area certainly encouraged the culture at the previous office, at the least.