When I was working in New York City, I always found employee secrecy over the salaries pretty interesting. It seemed like a taboo to tell someone your salary or ask them what they're paid.

I understand why employers would want to disincentive salary disclosures but employees? Your peers salary is clear indication of your valuation to the company and there should be every incentive to share. Back home in India, pretty much everyone knows each others salaries for all sizes of companies.