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Many of them are wearing red-ribboned lanyards, have water bottles (and no other drinks), and all visible monitors are running the same IRC-looking app, so it's probably some sort of training/class at a conference or a college programming contest. The photo is a stock photo.

The image has more information in the metadata:

>Contestants in the 2006 Google Global Code Jam stare at their computer screens at Google's New York office Friday, Oct. 27, 2006. One hundred of the best computer coders from around the world compete for prize money and bragging rights. The finalists from 20 countries are flown to New York by Google for the competition. (AP Photo/Mark Lennihan)

Usually the HVAC system can’t handle this many bodies.

Also, OSHA has rules about the ratio of bathrooms to humans of either gender are available and I’m pretty sure some of these employers are way over the limit. Good argument for reducing density or at least increasing gender equality in your open office plan.

Agreed. The pic looks more like a university resource center / library / computer lab.

This has to be some data entry type position - old Dell monitors and every seat taken.