Might be a job for a website, along the lines of a crowd funding site? People would post their salaries, but they would only be revealed (anonymously or not?)

Might be a job for a website, along the lines of a crowd funding site? People would post their salaries, but they would only be revealed (anonymously or not?) if a certain number of fellow employees also posted theirs (by a certain date?) Surely someone has already built this? It might include an mechanism to send an anonymous invitation email to a list of fellow employees? There are already salary survey sites, but they seem removed from the individual's situation, as the results are averaged over so many people and the underlying assumptions aren't clear. Knowing your immediate coworkers' salaries seems much more immediate. Trust and privacy would have to be absolute, so people have complete control over the spread of any information they submit, which rules out most existing websites. --- Edit: On further thought, I'm not sure that I agree with my own proposal, in that it's a complicated solution. Wouldn't it be better to establish the necessary level of trust with your coworkers in real life and talk about it? There's also less of a paper trail and information leakage that way.