I've seen this happen a few times. Seattle has had a few salary spreadsheets go around. It generally stays low level (under 5 years) and eventually gets flooded with fakes.

I wonder if what we really need is for it to just be straight public with your name attached.

What if LinkedIn had a salary section? Let you display your current or historical salary. Would people do that? Say what they make? Seems unlikely. What if it's what they used to make?

In Sweden this information is all public and searchable. So far their economy and culture hasn't collapsed.