What's the Most Accurate Salary Survey in your Country or Industry?

TL;DR: see title

Longer version

I have heard this answer too much and it makes my bool blood boil

Friend with an important question: I've been contacted by $company, what do you think I should ask?
Quick and unhelpful answer: Just do your own research. Just look on Glassdoor.

I'm sure some people have found Glassdoor useful. It probably works well for "Web Developer in San Francisco" because that's like 42% of the city population. Does that mean it universally applies, that the data isn't shit or useless elsewhere? Not in my experience.

Do you remember that after hearing the tip "just do your own research" for the first time, you knew exactly what to do? Well good for you, but many developers I know are not like that.

Your friend is asking an important question, she is at risk of being underpaid for many years in her life. And that sucks.

We can do better than that right?