How do you find out what the usual salary is for the kind of work that you do?
People don't talk about their salaries because they seem to think it's impolite, and websites like Glassdoor are useless (for me) because it's impossible to figure out what job titles at different companies correspond to what I do. (I also work for a small company where no one has exactly the same job as me.)
How do you guys get around these problems and find out what level of salary you should be looking for?