SalaryShare lets you see what your friends/colleagues/random strangers earn by pooling salary data anonymously from anyone who chooses to share it and then revealing the range of salaries disclosed to all participants. Nice idea. I have indeed occasionally been curious as to what other people earn.
Thing is...if people want to know that badly, can't one of the jobs boards (or more usefully jobs aggregators) simply store data on the salaries that were listed on historical job ads and make it searchable?
What am I missing here? Perhaps the jobs aggregators don't (or for some reason can't) store that data. but otherwise - if there really is demand for this sort of thing - it seems like an obvious space for them to get into. Nice hook to get people in to their sites, nice bit of PR, off the top of my head it'd be fairly easy to implement off their existing search tech. In which case Salaryshare would have a bit of a problem but them's the breaks.